net/netfilter/nf_tables_api.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2007-2009 Patrick McHardy <kaber@trash.net>
   4  *
   5  * Development of this code funded by Astaro AG (http://www.astaro.com/)
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/init.h>
  10 #include <linux/list.h>
  11 #include <linux/skbuff.h>
  12 #include <linux/netlink.h>
  13 #include <linux/vmalloc.h>
  14 #include <linux/rhashtable.h>
  15 #include <linux/audit.h>
  16 #include <linux/netfilter.h>
  17 #include <linux/netfilter/nfnetlink.h>
  18 #include <linux/netfilter/nf_tables.h>
  19 #include <net/netfilter/nf_flow_table.h>
  20 #include <net/netfilter/nf_tables_core.h>
  21 #include <net/netfilter/nf_tables.h>
  22 #include <net/netfilter/nf_tables_offload.h>
  23 #include <net/net_namespace.h>
  24 #include <net/sock.h>
  25
  26 #define NFT_MODULE_AUTOLOAD_LIMIT (MODULE_NAME_LEN - sizeof("nft-expr-255-"))
  27
  28 unsigned int nf_tables_net_id __read_mostly;
  29
  30 static LIST_HEAD(nf_tables_expressions);
  31 static LIST_HEAD(nf_tables_objects);
  32 static LIST_HEAD(nf_tables_flowtables);
  33 static LIST_HEAD(nf_tables_destroy_list);
  34 static DEFINE_SPINLOCK(nf_tables_destroy_list_lock);
  35
  36 enum {
  37         NFT_VALIDATE_SKIP       = 0,
  38         NFT_VALIDATE_NEED,
  39         NFT_VALIDATE_DO,
  40 };
  41
  42 static struct rhltable nft_objname_ht;
  43
  44 static u32 nft_chain_hash(const void *data, u32 len, u32 seed);
  45 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed);
  46 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *);
  47
  48 static u32 nft_objname_hash(const void *data, u32 len, u32 seed);
  49 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed);
  50 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *, const void *);
  51
  52 static const struct rhashtable_params nft_chain_ht_params = {
  53         .head_offset            = offsetof(struct nft_chain, rhlhead),
  54         .key_offset             = offsetof(struct nft_chain, name),
  55         .hashfn                 = nft_chain_hash,
  56         .obj_hashfn             = nft_chain_hash_obj,
  57         .obj_cmpfn              = nft_chain_hash_cmp,
  58         .automatic_shrinking    = true,
  59 };
  60
  61 static const struct rhashtable_params nft_objname_ht_params = {
  62         .head_offset            = offsetof(struct nft_object, rhlhead),
  63         .key_offset             = offsetof(struct nft_object, key),
  64         .hashfn                 = nft_objname_hash,
  65         .obj_hashfn             = nft_objname_hash_obj,
  66         .obj_cmpfn              = nft_objname_hash_cmp,
  67         .automatic_shrinking    = true,
  68 };
  69
  70 struct nft_audit_data {
  71         struct nft_table *table;
  72         int entries;
  73         int op;
  74         struct list_head list;
  75 };
  76
  77 static const u8 nft2audit_op[NFT_MSG_MAX] = { // enum nf_tables_msg_types
  78         [NFT_MSG_NEWTABLE]      = AUDIT_NFT_OP_TABLE_REGISTER,
  79         [NFT_MSG_GETTABLE]      = AUDIT_NFT_OP_INVALID,
  80         [NFT_MSG_DELTABLE]      = AUDIT_NFT_OP_TABLE_UNREGISTER,
  81         [NFT_MSG_NEWCHAIN]      = AUDIT_NFT_OP_CHAIN_REGISTER,
  82         [NFT_MSG_GETCHAIN]      = AUDIT_NFT_OP_INVALID,
  83         [NFT_MSG_DELCHAIN]      = AUDIT_NFT_OP_CHAIN_UNREGISTER,
  84         [NFT_MSG_NEWRULE]       = AUDIT_NFT_OP_RULE_REGISTER,
  85         [NFT_MSG_GETRULE]       = AUDIT_NFT_OP_INVALID,
  86         [NFT_MSG_DELRULE]       = AUDIT_NFT_OP_RULE_UNREGISTER,
  87         [NFT_MSG_NEWSET]        = AUDIT_NFT_OP_SET_REGISTER,
  88         [NFT_MSG_GETSET]        = AUDIT_NFT_OP_INVALID,
  89         [NFT_MSG_DELSET]        = AUDIT_NFT_OP_SET_UNREGISTER,
  90         [NFT_MSG_NEWSETELEM]    = AUDIT_NFT_OP_SETELEM_REGISTER,
  91         [NFT_MSG_GETSETELEM]    = AUDIT_NFT_OP_INVALID,
  92         [NFT_MSG_DELSETELEM]    = AUDIT_NFT_OP_SETELEM_UNREGISTER,
  93         [NFT_MSG_NEWGEN]        = AUDIT_NFT_OP_GEN_REGISTER,
  94         [NFT_MSG_GETGEN]        = AUDIT_NFT_OP_INVALID,
  95         [NFT_MSG_TRACE]         = AUDIT_NFT_OP_INVALID,
  96         [NFT_MSG_NEWOBJ]        = AUDIT_NFT_OP_OBJ_REGISTER,
  97         [NFT_MSG_GETOBJ]        = AUDIT_NFT_OP_INVALID,
  98         [NFT_MSG_DELOBJ]        = AUDIT_NFT_OP_OBJ_UNREGISTER,
  99         [NFT_MSG_GETOBJ_RESET]  = AUDIT_NFT_OP_OBJ_RESET,
 100         [NFT_MSG_NEWFLOWTABLE]  = AUDIT_NFT_OP_FLOWTABLE_REGISTER,
 101         [NFT_MSG_GETFLOWTABLE]  = AUDIT_NFT_OP_INVALID,
 102         [NFT_MSG_DELFLOWTABLE]  = AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
 103 };
 104
 105 static void nft_validate_state_update(struct net *net, u8 new_validate_state)
 106 {
 107         struct nftables_pernet *nft_net = nft_pernet(net);
 108
 109         switch (nft_net->validate_state) {
 110         case NFT_VALIDATE_SKIP:
 111                 WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
 112                 break;
 113         case NFT_VALIDATE_NEED:
 114                 break;
 115         case NFT_VALIDATE_DO:
 116                 if (new_validate_state == NFT_VALIDATE_NEED)
 117                         return;
 118         }
 119
 120         nft_net->validate_state = new_validate_state;
 121 }
 122 static void nf_tables_trans_destroy_work(struct work_struct *w);
 123 static DECLARE_WORK(trans_destroy_work, nf_tables_trans_destroy_work);
 124
 125 static void nft_ctx_init(struct nft_ctx *ctx,
 126                          struct net *net,
 127                          const struct sk_buff *skb,
 128                          const struct nlmsghdr *nlh,
 129                          u8 family,
 130                          struct nft_table *table,
 131                          struct nft_chain *chain,
 132                          const struct nlattr * const *nla)
 133 {
 134         ctx->net        = net;
 135         ctx->family     = family;
 136         ctx->level      = 0;
 137         ctx->table      = table;
 138         ctx->chain      = chain;
 139         ctx->nla        = nla;
 140         ctx->portid     = NETLINK_CB(skb).portid;
 141         ctx->report     = nlmsg_report(nlh);
 142         ctx->flags      = nlh->nlmsg_flags;
 143         ctx->seq        = nlh->nlmsg_seq;
 144 }
 145
 146 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
 147                                              int msg_type, u32 size, gfp_t gfp)
 148 {
 149         struct nft_trans *trans;
 150
 151         trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
 152         if (trans == NULL)
 153                 return NULL;
 154
 155         INIT_LIST_HEAD(&trans->list);
 156         trans->msg_type = msg_type;
 157         trans->ctx      = *ctx;
 158
 159         return trans;
 160 }
 161
 162 static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
 163                                          int msg_type, u32 size)
 164 {
 165         return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
 166 }
 167
 168 static void nft_trans_destroy(struct nft_trans *trans)
 169 {
 170         list_del(&trans->list);
 171         kfree(trans);
 172 }
 173
 174 static void nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set)
 175 {
 176         struct nftables_pernet *nft_net;
 177         struct net *net = ctx->net;
 178         struct nft_trans *trans;
 179
 180         if (!nft_set_is_anonymous(set))
 181                 return;
 182
 183         nft_net = nft_pernet(net);
 184         list_for_each_entry_reverse(trans, &nft_net->commit_list, list) {
 185                 switch (trans->msg_type) {
 186                 case NFT_MSG_NEWSET:
 187                         if (nft_trans_set(trans) == set)
 188                                 nft_trans_set_bound(trans) = true;
 189                         break;
 190                 case NFT_MSG_NEWSETELEM:
 191                         if (nft_trans_elem_set(trans) == set)
 192                                 nft_trans_elem_set_bound(trans) = true;
 193                         break;
 194                 }
 195         }
 196 }
 197
 198 static int nft_netdev_register_hooks(struct net *net,
 199                                      struct list_head *hook_list)
 200 {
 201         struct nft_hook *hook;
 202         int err, j;
 203
 204         j = 0;
 205         list_for_each_entry(hook, hook_list, list) {
 206                 err = nf_register_net_hook(net, &hook->ops);
 207                 if (err < 0)
 208                         goto err_register;
 209
 210                 j++;
 211         }
 212         return 0;
 213
 214 err_register:
 215         list_for_each_entry(hook, hook_list, list) {
 216                 if (j-- <= 0)
 217                         break;
 218
 219                 nf_unregister_net_hook(net, &hook->ops);
 220         }
 221         return err;
 222 }
 223
 224 static void nft_netdev_unregister_hooks(struct net *net,
 225                                         struct list_head *hook_list,
 226                                         bool release_netdev)
 227 {
 228         struct nft_hook *hook, *next;
 229
 230         list_for_each_entry_safe(hook, next, hook_list, list) {
 231                 nf_unregister_net_hook(net, &hook->ops);
 232                 if (release_netdev) {
 233                         list_del(&hook->list);
 234                         kfree_rcu(hook, rcu);
 235                 }
 236         }
 237 }
 238
 239 static int nf_tables_register_hook(struct net *net,
 240                                    const struct nft_table *table,
 241                                    struct nft_chain *chain)
 242 {
 243         struct nft_base_chain *basechain;
 244         const struct nf_hook_ops *ops;
 245
 246         if (table->flags & NFT_TABLE_F_DORMANT ||
 247             !nft_is_base_chain(chain))
 248                 return 0;
 249
 250         basechain = nft_base_chain(chain);
 251         ops = &basechain->ops;
 252
 253         if (basechain->type->ops_register)
 254                 return basechain->type->ops_register(net, ops);
 255
 256         if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
 257                 return nft_netdev_register_hooks(net, &basechain->hook_list);
 258
 259         return nf_register_net_hook(net, &basechain->ops);
 260 }
 261
 262 static void __nf_tables_unregister_hook(struct net *net,
 263                                         const struct nft_table *table,
 264                                         struct nft_chain *chain,
 265                                         bool release_netdev)
 266 {
 267         struct nft_base_chain *basechain;
 268         const struct nf_hook_ops *ops;
 269
 270         if (table->flags & NFT_TABLE_F_DORMANT ||
 271             !nft_is_base_chain(chain))
 272                 return;
 273         basechain = nft_base_chain(chain);
 274         ops = &basechain->ops;
 275
 276         if (basechain->type->ops_unregister)
 277                 return basechain->type->ops_unregister(net, ops);
 278
 279         if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
 280                 nft_netdev_unregister_hooks(net, &basechain->hook_list,
 281                                             release_netdev);
 282         else
 283                 nf_unregister_net_hook(net, &basechain->ops);
 284 }
 285
 286 static void nf_tables_unregister_hook(struct net *net,
 287                                       const struct nft_table *table,
 288                                       struct nft_chain *chain)
 289 {
 290         return __nf_tables_unregister_hook(net, table, chain, false);
 291 }
 292
 293 static void nft_trans_commit_list_add_tail(struct net *net, struct nft_trans *trans)
 294 {
 295         struct nftables_pernet *nft_net = nft_pernet(net);
 296
 297         list_add_tail(&trans->list, &nft_net->commit_list);
 298 }
 299
 300 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
 301 {
 302         struct nft_trans *trans;
 303
 304         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
 305         if (trans == NULL)
 306                 return -ENOMEM;
 307
 308         if (msg_type == NFT_MSG_NEWTABLE)
 309                 nft_activate_next(ctx->net, ctx->table);
 310
 311         nft_trans_commit_list_add_tail(ctx->net, trans);
 312         return 0;
 313 }
 314
 315 static int nft_deltable(struct nft_ctx *ctx)
 316 {
 317         int err;
 318
 319         err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
 320         if (err < 0)
 321                 return err;
 322
 323         nft_deactivate_next(ctx->net, ctx->table);
 324         return err;
 325 }
 326
 327 static struct nft_trans *nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
 328 {
 329         struct nft_trans *trans;
 330
 331         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
 332         if (trans == NULL)
 333                 return ERR_PTR(-ENOMEM);
 334
 335         if (msg_type == NFT_MSG_NEWCHAIN) {
 336                 nft_activate_next(ctx->net, ctx->chain);
 337
 338                 if (ctx->nla[NFTA_CHAIN_ID]) {
 339                         nft_trans_chain_id(trans) =
 340                                 ntohl(nla_get_be32(ctx->nla[NFTA_CHAIN_ID]));
 341                 }
 342         }
 343
 344         nft_trans_commit_list_add_tail(ctx->net, trans);
 345         return trans;
 346 }
 347
 348 static int nft_delchain(struct nft_ctx *ctx)
 349 {
 350         struct nft_trans *trans;
 351
 352         trans = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
 353         if (IS_ERR(trans))
 354                 return PTR_ERR(trans);
 355
 356         ctx->table->use--;
 357         nft_deactivate_next(ctx->net, ctx->chain);
 358
 359         return 0;
 360 }
 361
 362 static void nft_rule_expr_activate(const struct nft_ctx *ctx,
 363                                    struct nft_rule *rule)
 364 {
 365         struct nft_expr *expr;
 366
 367         expr = nft_expr_first(rule);
 368         while (nft_expr_more(rule, expr)) {
 369                 if (expr->ops->activate)
 370                         expr->ops->activate(ctx, expr);
 371
 372                 expr = nft_expr_next(expr);
 373         }
 374 }
 375
 376 static void nft_rule_expr_deactivate(const struct nft_ctx *ctx,
 377                                      struct nft_rule *rule,
 378                                      enum nft_trans_phase phase)
 379 {
 380         struct nft_expr *expr;
 381
 382         expr = nft_expr_first(rule);
 383         while (nft_expr_more(rule, expr)) {
 384                 if (expr->ops->deactivate)
 385                         expr->ops->deactivate(ctx, expr, phase);
 386
 387                 expr = nft_expr_next(expr);
 388         }
 389 }
 390
 391 static int
 392 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
 393 {
 394         /* You cannot delete the same rule twice */
 395         if (nft_is_active_next(ctx->net, rule)) {
 396                 nft_deactivate_next(ctx->net, rule);
 397                 ctx->chain->use--;
 398                 return 0;
 399         }
 400         return -ENOENT;
 401 }
 402
 403 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
 404                                             struct nft_rule *rule)
 405 {
 406         struct nft_trans *trans;
 407
 408         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
 409         if (trans == NULL)
 410                 return NULL;
 411
 412         if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
 413                 nft_trans_rule_id(trans) =
 414                         ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
 415         }
 416         nft_trans_rule(trans) = rule;
 417         nft_trans_commit_list_add_tail(ctx->net, trans);
 418
 419         return trans;
 420 }
 421
 422 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
 423 {
 424         struct nft_flow_rule *flow;
 425         struct nft_trans *trans;
 426         int err;
 427
 428         trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
 429         if (trans == NULL)
 430                 return -ENOMEM;
 431
 432         if (ctx->chain->flags & NFT_CHAIN_HW_OFFLOAD) {
 433                 flow = nft_flow_rule_create(ctx->net, rule);
 434                 if (IS_ERR(flow)) {
 435                         nft_trans_destroy(trans);
 436                         return PTR_ERR(flow);
 437                 }
 438
 439                 nft_trans_flow_rule(trans) = flow;
 440         }
 441
 442         err = nf_tables_delrule_deactivate(ctx, rule);
 443         if (err < 0) {
 444                 nft_trans_destroy(trans);
 445                 return err;
 446         }
 447         nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_PREPARE);
 448
 449         return 0;
 450 }
 451
 452 static int nft_delrule_by_chain(struct nft_ctx *ctx)
 453 {
 454         struct nft_rule *rule;
 455         int err;
 456
 457         list_for_each_entry(rule, &ctx->chain->rules, list) {
 458                 if (!nft_is_active_next(ctx->net, rule))
 459                         continue;
 460
 461                 err = nft_delrule(ctx, rule);
 462                 if (err < 0)
 463                         return err;
 464         }
 465         return 0;
 466 }
 467
 468 static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
 469                              struct nft_set *set)
 470 {
 471         struct nft_trans *trans;
 472
 473         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
 474         if (trans == NULL)
 475                 return -ENOMEM;
 476
 477         if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
 478                 nft_trans_set_id(trans) =
 479                         ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
 480                 nft_activate_next(ctx->net, set);
 481         }
 482         nft_trans_set(trans) = set;
 483         nft_trans_commit_list_add_tail(ctx->net, trans);
 484
 485         return 0;
 486 }
 487
 488 static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set)
 489 {
 490         int err;
 491
 492         err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
 493         if (err < 0)
 494                 return err;
 495
 496         nft_deactivate_next(ctx->net, set);
 497         ctx->table->use--;
 498
 499         return err;
 500 }
 501
 502 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
 503                              struct nft_object *obj)
 504 {
 505         struct nft_trans *trans;
 506
 507         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
 508         if (trans == NULL)
 509                 return -ENOMEM;
 510
 511         if (msg_type == NFT_MSG_NEWOBJ)
 512                 nft_activate_next(ctx->net, obj);
 513
 514         nft_trans_obj(trans) = obj;
 515         nft_trans_commit_list_add_tail(ctx->net, trans);
 516
 517         return 0;
 518 }
 519
 520 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
 521 {
 522         int err;
 523
 524         err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
 525         if (err < 0)
 526                 return err;
 527
 528         nft_deactivate_next(ctx->net, obj);
 529         ctx->table->use--;
 530
 531         return err;
 532 }
 533
 534 static int nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
 535                                    struct nft_flowtable *flowtable)
 536 {
 537         struct nft_trans *trans;
 538
 539         trans = nft_trans_alloc(ctx, msg_type,
 540                                 sizeof(struct nft_trans_flowtable));
 541         if (trans == NULL)
 542                 return -ENOMEM;
 543
 544         if (msg_type == NFT_MSG_NEWFLOWTABLE)
 545                 nft_activate_next(ctx->net, flowtable);
 546
 547         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
 548         nft_trans_flowtable(trans) = flowtable;
 549         nft_trans_commit_list_add_tail(ctx->net, trans);
 550
 551         return 0;
 552 }
 553
 554 static int nft_delflowtable(struct nft_ctx *ctx,
 555                             struct nft_flowtable *flowtable)
 556 {
 557         int err;
 558
 559         err = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
 560         if (err < 0)
 561                 return err;
 562
 563         nft_deactivate_next(ctx->net, flowtable);
 564         ctx->table->use--;
 565
 566         return err;
 567 }
 568
 569 static void __nft_reg_track_clobber(struct nft_regs_track *track, u8 dreg)
 570 {
 571         int i;
 572
 573         for (i = track->regs[dreg].num_reg; i > 0; i--)
 574                 __nft_reg_track_cancel(track, dreg - i);
 575 }
 576
 577 static void __nft_reg_track_update(struct nft_regs_track *track,
 578                                    const struct nft_expr *expr,
 579                                    u8 dreg, u8 num_reg)
 580 {
 581         track->regs[dreg].selector = expr;
 582         track->regs[dreg].bitwise = NULL;
 583         track->regs[dreg].num_reg = num_reg;
 584 }
 585
 586 void nft_reg_track_update(struct nft_regs_track *track,
 587                           const struct nft_expr *expr, u8 dreg, u8 len)
 588 {
 589         unsigned int regcount;
 590         int i;
 591
 592         __nft_reg_track_clobber(track, dreg);
 593
 594         regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE);
 595         for (i = 0; i < regcount; i++, dreg++)
 596                 __nft_reg_track_update(track, expr, dreg, i);
 597 }
 598 EXPORT_SYMBOL_GPL(nft_reg_track_update);
 599
 600 void nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg, u8 len)
 601 {
 602         unsigned int regcount;
 603         int i;
 604
 605         __nft_reg_track_clobber(track, dreg);
 606
 607         regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE);
 608         for (i = 0; i < regcount; i++, dreg++)
 609                 __nft_reg_track_cancel(track, dreg);
 610 }
 611 EXPORT_SYMBOL_GPL(nft_reg_track_cancel);
 612
 613 void __nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg)
 614 {
 615         track->regs[dreg].selector = NULL;
 616         track->regs[dreg].bitwise = NULL;
 617         track->regs[dreg].num_reg = 0;
 618 }
 619 EXPORT_SYMBOL_GPL(__nft_reg_track_cancel);
 620
 621 /*
 622  * Tables
 623  */
 624
 625 static struct nft_table *nft_table_lookup(const struct net *net,
 626                                           const struct nlattr *nla,
 627                                           u8 family, u8 genmask, u32 nlpid)
 628 {
 629         struct nftables_pernet *nft_net;
 630         struct nft_table *table;
 631
 632         if (nla == NULL)
 633                 return ERR_PTR(-EINVAL);
 634
 635         nft_net = nft_pernet(net);
 636         list_for_each_entry_rcu(table, &nft_net->tables, list,
 637                                 lockdep_is_held(&nft_net->commit_mutex)) {
 638                 if (!nla_strcmp(nla, table->name) &&
 639                     table->family == family &&
 640                     nft_active_genmask(table, genmask)) {
 641                         if (nft_table_has_owner(table) &&
 642                             nlpid && table->nlpid != nlpid)
 643                                 return ERR_PTR(-EPERM);
 644
 645                         return table;
 646                 }
 647         }
 648
 649         return ERR_PTR(-ENOENT);
 650 }
 651
 652 static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
 653                                                    const struct nlattr *nla,
 654                                                    u8 genmask, u32 nlpid)
 655 {
 656         struct nftables_pernet *nft_net;
 657         struct nft_table *table;
 658
 659         nft_net = nft_pernet(net);
 660         list_for_each_entry(table, &nft_net->tables, list) {
 661                 if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
 662                     nft_active_genmask(table, genmask)) {
 663                         if (nft_table_has_owner(table) &&
 664                             nlpid && table->nlpid != nlpid)
 665                                 return ERR_PTR(-EPERM);
 666
 667                         return table;
 668                 }
 669         }
 670
 671         return ERR_PTR(-ENOENT);
 672 }
 673
 674 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
 675 {
 676         return ++table->hgenerator;
 677 }
 678
 679 static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
 680
 681 static const struct nft_chain_type *
 682 __nft_chain_type_get(u8 family, enum nft_chain_types type)
 683 {
 684         if (family >= NFPROTO_NUMPROTO ||
 685             type >= NFT_CHAIN_T_MAX)
 686                 return NULL;
 687
 688         return chain_type[family][type];
 689 }
 690
 691 static const struct nft_chain_type *
 692 __nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
 693 {
 694         const struct nft_chain_type *type;
 695         int i;
 696
 697         for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
 698                 type = __nft_chain_type_get(family, i);
 699                 if (!type)
 700                         continue;
 701                 if (!nla_strcmp(nla, type->name))
 702                         return type;
 703         }
 704         return NULL;
 705 }
 706
 707 struct nft_module_request {
 708         struct list_head        list;
 709         char                    module[MODULE_NAME_LEN];
 710         bool                    done;
 711 };
 712
 713 #ifdef CONFIG_MODULES
 714 __printf(2, 3) int nft_request_module(struct net *net, const char *fmt,
 715                                       ...)
 716 {
 717         char module_name[MODULE_NAME_LEN];
 718         struct nftables_pernet *nft_net;
 719         struct nft_module_request *req;
 720         va_list args;
 721         int ret;
 722
 723         va_start(args, fmt);
 724         ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
 725         va_end(args);
 726         if (ret >= MODULE_NAME_LEN)
 727                 return 0;
 728
 729         nft_net = nft_pernet(net);
 730         list_for_each_entry(req, &nft_net->module_list, list) {
 731                 if (!strcmp(req->module, module_name)) {
 732                         if (req->done)
 733                                 return 0;
 734
 735                         /* A request to load this module already exists. */
 736                         return -EAGAIN;
 737                 }
 738         }
 739
 740         req = kmalloc(sizeof(*req), GFP_KERNEL);
 741         if (!req)
 742                 return -ENOMEM;
 743
 744         req->done = false;
 745         strscpy(req->module, module_name, MODULE_NAME_LEN);
 746         list_add_tail(&req->list, &nft_net->module_list);
 747
 748         return -EAGAIN;
 749 }
 750 EXPORT_SYMBOL_GPL(nft_request_module);
 751 #endif
 752
 753 static void lockdep_nfnl_nft_mutex_not_held(void)
 754 {
 755 #ifdef CONFIG_PROVE_LOCKING
 756         if (debug_locks)
 757                 WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
 758 #endif
 759 }
 760
 761 static const struct nft_chain_type *
 762 nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
 763                             u8 family, bool autoload)
 764 {
 765         const struct nft_chain_type *type;
 766
 767         type = __nf_tables_chain_type_lookup(nla, family);
 768         if (type != NULL)
 769                 return type;
 770
 771         lockdep_nfnl_nft_mutex_not_held();
 772 #ifdef CONFIG_MODULES
 773         if (autoload) {
 774                 if (nft_request_module(net, "nft-chain-%u-%.*s", family,
 775                                        nla_len(nla),
 776                                        (const char *)nla_data(nla)) == -EAGAIN)
 777                         return ERR_PTR(-EAGAIN);
 778         }
 779 #endif
 780         return ERR_PTR(-ENOENT);
 781 }
 782
 783 static __be16 nft_base_seq(const struct net *net)
 784 {
 785         struct nftables_pernet *nft_net = nft_pernet(net);
 786
 787         return htons(nft_net->base_seq & 0xffff);
 788 }
 789
 790 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
 791         [NFTA_TABLE_NAME]       = { .type = NLA_STRING,
 792                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
 793         [NFTA_TABLE_FLAGS]      = { .type = NLA_U32 },
 794         [NFTA_TABLE_HANDLE]     = { .type = NLA_U64 },
 795         [NFTA_TABLE_USERDATA]   = { .type = NLA_BINARY,
 796                                     .len = NFT_USERDATA_MAXLEN }
 797 };
 798
 799 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
 800                                      u32 portid, u32 seq, int event, u32 flags,
 801                                      int family, const struct nft_table *table)
 802 {
 803         struct nlmsghdr *nlh;
 804
 805         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
 806         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
 807                            NFNETLINK_V0, nft_base_seq(net));
 808         if (!nlh)
 809                 goto nla_put_failure;
 810
 811         if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
 812             nla_put_be32(skb, NFTA_TABLE_FLAGS,
 813                          htonl(table->flags & NFT_TABLE_F_MASK)) ||
 814             nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
 815             nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
 816                          NFTA_TABLE_PAD))
 817                 goto nla_put_failure;
 818         if (nft_table_has_owner(table) &&
 819             nla_put_be32(skb, NFTA_TABLE_OWNER, htonl(table->nlpid)))
 820                 goto nla_put_failure;
 821
 822         if (table->udata) {
 823                 if (nla_put(skb, NFTA_TABLE_USERDATA, table->udlen, table->udata))
 824                         goto nla_put_failure;
 825         }
 826
 827         nlmsg_end(skb, nlh);
 828         return 0;
 829
 830 nla_put_failure:
 831         nlmsg_trim(skb, nlh);
 832         return -1;
 833 }
 834
 835 struct nftnl_skb_parms {
 836         bool report;
 837 };
 838 #define NFT_CB(skb)     (*(struct nftnl_skb_parms*)&((skb)->cb))
 839
 840 static void nft_notify_enqueue(struct sk_buff *skb, bool report,
 841                                struct list_head *notify_list)
 842 {
 843         NFT_CB(skb).report = report;
 844         list_add_tail(&skb->list, notify_list);
 845 }
 846
 847 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
 848 {
 849         struct nftables_pernet *nft_net;
 850         struct sk_buff *skb;
 851         u16 flags = 0;
 852         int err;
 853
 854         if (!ctx->report &&
 855             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
 856                 return;
 857
 858         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 859         if (skb == NULL)
 860                 goto err;
 861
 862         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
 863                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
 864
 865         err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
 866                                         event, flags, ctx->family, ctx->table);
 867         if (err < 0) {
 868                 kfree_skb(skb);
 869                 goto err;
 870         }
 871
 872         nft_net = nft_pernet(ctx->net);
 873         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
 874         return;
 875 err:
 876         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
 877 }
 878
 879 static int nf_tables_dump_tables(struct sk_buff *skb,
 880                                  struct netlink_callback *cb)
 881 {
 882         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
 883         struct nftables_pernet *nft_net;
 884         const struct nft_table *table;
 885         unsigned int idx = 0, s_idx = cb->args[0];
 886         struct net *net = sock_net(skb->sk);
 887         int family = nfmsg->nfgen_family;
 888
 889         rcu_read_lock();
 890         nft_net = nft_pernet(net);
 891         cb->seq = READ_ONCE(nft_net->base_seq);
 892
 893         list_for_each_entry_rcu(table, &nft_net->tables, list) {
 894                 if (family != NFPROTO_UNSPEC && family != table->family)
 895                         continue;
 896
 897                 if (idx < s_idx)
 898                         goto cont;
 899                 if (idx > s_idx)
 900                         memset(&cb->args[1], 0,
 901                                sizeof(cb->args) - sizeof(cb->args[0]));
 902                 if (!nft_is_active(net, table))
 903                         continue;
 904                 if (nf_tables_fill_table_info(skb, net,
 905                                               NETLINK_CB(cb->skb).portid,
 906                                               cb->nlh->nlmsg_seq,
 907                                               NFT_MSG_NEWTABLE, NLM_F_MULTI,
 908                                               table->family, table) < 0)
 909                         goto done;
 910
 911                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
 912 cont:
 913                 idx++;
 914         }
 915 done:
 916         rcu_read_unlock();
 917         cb->args[0] = idx;
 918         return skb->len;
 919 }
 920
 921 static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
 922                                       const struct nlmsghdr *nlh,
 923                                       struct netlink_dump_control *c)
 924 {
 925         int err;
 926
 927         if (!try_module_get(THIS_MODULE))
 928                 return -EINVAL;
 929
 930         rcu_read_unlock();
 931         err = netlink_dump_start(nlsk, skb, nlh, c);
 932         rcu_read_lock();
 933         module_put(THIS_MODULE);
 934
 935         return err;
 936 }
 937
 938 /* called with rcu_read_lock held */
 939 static int nf_tables_gettable(struct sk_buff *skb, const struct nfnl_info *info,
 940                               const struct nlattr * const nla[])
 941 {
 942         struct netlink_ext_ack *extack = info->extack;
 943         u8 genmask = nft_genmask_cur(info->net);
 944         u8 family = info->nfmsg->nfgen_family;
 945         const struct nft_table *table;
 946         struct net *net = info->net;
 947         struct sk_buff *skb2;
 948         int err;
 949
 950         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
 951                 struct netlink_dump_control c = {
 952                         .dump = nf_tables_dump_tables,
 953                         .module = THIS_MODULE,
 954                 };
 955
 956                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
 957         }
 958
 959         table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask, 0);
 960         if (IS_ERR(table)) {
 961                 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
 962                 return PTR_ERR(table);
 963         }
 964
 965         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
 966         if (!skb2)
 967                 return -ENOMEM;
 968
 969         err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
 970                                         info->nlh->nlmsg_seq, NFT_MSG_NEWTABLE,
 971                                         0, family, table);
 972         if (err < 0)
 973                 goto err_fill_table_info;
 974
 975         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
 976
 977 err_fill_table_info:
 978         kfree_skb(skb2);
 979         return err;
 980 }
 981
 982 static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
 983 {
 984         struct nft_chain *chain;
 985         u32 i = 0;
 986
 987         list_for_each_entry(chain, &table->chains, list) {
 988                 if (!nft_is_active_next(net, chain))
 989                         continue;
 990                 if (!nft_is_base_chain(chain))
 991                         continue;
 992
 993                 if (cnt && i++ == cnt)
 994                         break;
 995
 996                 nf_tables_unregister_hook(net, table, chain);
 997         }
 998 }
 999
1000 static int nf_tables_table_enable(struct net *net, struct nft_table *table)
1001 {
1002         struct nft_chain *chain;
1003         int err, i = 0;
1004
1005         list_for_each_entry(chain, &table->chains, list) {
1006                 if (!nft_is_active_next(net, chain))
1007                         continue;
1008                 if (!nft_is_base_chain(chain))
1009                         continue;
1010
1011                 err = nf_tables_register_hook(net, table, chain);
1012                 if (err < 0)
1013                         goto err_register_hooks;
1014
1015                 i++;
1016         }
1017         return 0;
1018
1019 err_register_hooks:
1020         if (i)
1021                 nft_table_disable(net, table, i);
1022         return err;
1023 }
1024
1025 static void nf_tables_table_disable(struct net *net, struct nft_table *table)
1026 {
1027         table->flags &= ~NFT_TABLE_F_DORMANT;
1028         nft_table_disable(net, table, 0);
1029         table->flags |= NFT_TABLE_F_DORMANT;
1030 }
1031
1032 #define __NFT_TABLE_F_INTERNAL          (NFT_TABLE_F_MASK + 1)
1033 #define __NFT_TABLE_F_WAS_DORMANT       (__NFT_TABLE_F_INTERNAL << 0)
1034 #define __NFT_TABLE_F_WAS_AWAKEN        (__NFT_TABLE_F_INTERNAL << 1)
1035 #define __NFT_TABLE_F_UPDATE            (__NFT_TABLE_F_WAS_DORMANT | \
1036                                          __NFT_TABLE_F_WAS_AWAKEN)
1037
1038 static int nf_tables_updtable(struct nft_ctx *ctx)
1039 {
1040         struct nft_trans *trans;
1041         u32 flags;
1042         int ret;
1043
1044         if (!ctx->nla[NFTA_TABLE_FLAGS])
1045                 return 0;
1046
1047         flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
1048         if (flags & ~NFT_TABLE_F_MASK)
1049                 return -EOPNOTSUPP;
1050
1051         if (flags == ctx->table->flags)
1052                 return 0;
1053
1054         if ((nft_table_has_owner(ctx->table) &&
1055              !(flags & NFT_TABLE_F_OWNER)) ||
1056             (!nft_table_has_owner(ctx->table) &&
1057              flags & NFT_TABLE_F_OWNER))
1058                 return -EOPNOTSUPP;
1059
1060         trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
1061                                 sizeof(struct nft_trans_table));
1062         if (trans == NULL)
1063                 return -ENOMEM;
1064
1065         if ((flags & NFT_TABLE_F_DORMANT) &&
1066             !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
1067                 ctx->table->flags |= NFT_TABLE_F_DORMANT;
1068                 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE))
1069                         ctx->table->flags |= __NFT_TABLE_F_WAS_AWAKEN;
1070         } else if (!(flags & NFT_TABLE_F_DORMANT) &&
1071                    ctx->table->flags & NFT_TABLE_F_DORMANT) {
1072                 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
1073                 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE)) {
1074                         ret = nf_tables_table_enable(ctx->net, ctx->table);
1075                         if (ret < 0)
1076                                 goto err_register_hooks;
1077
1078                         ctx->table->flags |= __NFT_TABLE_F_WAS_DORMANT;
1079                 }
1080         }
1081
1082         nft_trans_table_update(trans) = true;
1083         nft_trans_commit_list_add_tail(ctx->net, trans);
1084
1085         return 0;
1086
1087 err_register_hooks:
1088         nft_trans_destroy(trans);
1089         return ret;
1090 }
1091
1092 static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
1093 {
1094         const char *name = data;
1095
1096         return jhash(name, strlen(name), seed);
1097 }
1098
1099 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
1100 {
1101         const struct nft_chain *chain = data;
1102
1103         return nft_chain_hash(chain->name, 0, seed);
1104 }
1105
1106 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
1107                               const void *ptr)
1108 {
1109         const struct nft_chain *chain = ptr;
1110         const char *name = arg->key;
1111
1112         return strcmp(chain->name, name);
1113 }
1114
1115 static u32 nft_objname_hash(const void *data, u32 len, u32 seed)
1116 {
1117         const struct nft_object_hash_key *k = data;
1118
1119         seed ^= hash_ptr(k->table, 32);
1120
1121         return jhash(k->name, strlen(k->name), seed);
1122 }
1123
1124 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed)
1125 {
1126         const struct nft_object *obj = data;
1127
1128         return nft_objname_hash(&obj->key, 0, seed);
1129 }
1130
1131 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
1132                                 const void *ptr)
1133 {
1134         const struct nft_object_hash_key *k = arg->key;
1135         const struct nft_object *obj = ptr;
1136
1137         if (obj->key.table != k->table)
1138                 return -1;
1139
1140         return strcmp(obj->key.name, k->name);
1141 }
1142
1143 static bool nft_supported_family(u8 family)
1144 {
1145         return false
1146 #ifdef CONFIG_NF_TABLES_INET
1147                 || family == NFPROTO_INET
1148 #endif
1149 #ifdef CONFIG_NF_TABLES_IPV4
1150                 || family == NFPROTO_IPV4
1151 #endif
1152 #ifdef CONFIG_NF_TABLES_ARP
1153                 || family == NFPROTO_ARP
1154 #endif
1155 #ifdef CONFIG_NF_TABLES_NETDEV
1156                 || family == NFPROTO_NETDEV
1157 #endif
1158 #if IS_ENABLED(CONFIG_NF_TABLES_BRIDGE)
1159                 || family == NFPROTO_BRIDGE
1160 #endif
1161 #ifdef CONFIG_NF_TABLES_IPV6
1162                 || family == NFPROTO_IPV6
1163 #endif
1164                 ;
1165 }
1166
1167 static int nf_tables_newtable(struct sk_buff *skb, const struct nfnl_info *info,
1168                               const struct nlattr * const nla[])
1169 {
1170         struct nftables_pernet *nft_net = nft_pernet(info->net);
1171         struct netlink_ext_ack *extack = info->extack;
1172         u8 genmask = nft_genmask_next(info->net);
1173         u8 family = info->nfmsg->nfgen_family;
1174         struct net *net = info->net;
1175         const struct nlattr *attr;
1176         struct nft_table *table;
1177         struct nft_ctx ctx;
1178         u32 flags = 0;
1179         int err;
1180
1181         if (!nft_supported_family(family))
1182                 return -EOPNOTSUPP;
1183
1184         lockdep_assert_held(&nft_net->commit_mutex);
1185         attr = nla[NFTA_TABLE_NAME];
1186         table = nft_table_lookup(net, attr, family, genmask,
1187                                  NETLINK_CB(skb).portid);
1188         if (IS_ERR(table)) {
1189                 if (PTR_ERR(table) != -ENOENT)
1190                         return PTR_ERR(table);
1191         } else {
1192                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
1193                         NL_SET_BAD_ATTR(extack, attr);
1194                         return -EEXIST;
1195                 }
1196                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
1197                         return -EOPNOTSUPP;
1198
1199                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1200
1201                 return nf_tables_updtable(&ctx);
1202         }
1203
1204         if (nla[NFTA_TABLE_FLAGS]) {
1205                 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
1206                 if (flags & ~NFT_TABLE_F_MASK)
1207                         return -EOPNOTSUPP;
1208         }
1209
1210         err = -ENOMEM;
1211         table = kzalloc(sizeof(*table), GFP_KERNEL_ACCOUNT);
1212         if (table == NULL)
1213                 goto err_kzalloc;
1214
1215         table->name = nla_strdup(attr, GFP_KERNEL_ACCOUNT);
1216         if (table->name == NULL)
1217                 goto err_strdup;
1218
1219         if (nla[NFTA_TABLE_USERDATA]) {
1220                 table->udata = nla_memdup(nla[NFTA_TABLE_USERDATA], GFP_KERNEL_ACCOUNT);
1221                 if (table->udata == NULL)
1222                         goto err_table_udata;
1223
1224                 table->udlen = nla_len(nla[NFTA_TABLE_USERDATA]);
1225         }
1226
1227         err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
1228         if (err)
1229                 goto err_chain_ht;
1230
1231         INIT_LIST_HEAD(&table->chains);
1232         INIT_LIST_HEAD(&table->sets);
1233         INIT_LIST_HEAD(&table->objects);
1234         INIT_LIST_HEAD(&table->flowtables);
1235         table->family = family;
1236         table->flags = flags;
1237         table->handle = ++nft_net->table_handle;
1238         if (table->flags & NFT_TABLE_F_OWNER)
1239                 table->nlpid = NETLINK_CB(skb).portid;
1240
1241         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1242         err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
1243         if (err < 0)
1244                 goto err_trans;
1245
1246         list_add_tail_rcu(&table->list, &nft_net->tables);
1247         return 0;
1248 err_trans:
1249         rhltable_destroy(&table->chains_ht);
1250 err_chain_ht:
1251         kfree(table->udata);
1252 err_table_udata:
1253         kfree(table->name);
1254 err_strdup:
1255         kfree(table);
1256 err_kzalloc:
1257         return err;
1258 }
1259
1260 static int nft_flush_table(struct nft_ctx *ctx)
1261 {
1262         struct nft_flowtable *flowtable, *nft;
1263         struct nft_chain *chain, *nc;
1264         struct nft_object *obj, *ne;
1265         struct nft_set *set, *ns;
1266         int err;
1267
1268         list_for_each_entry(chain, &ctx->table->chains, list) {
1269                 if (!nft_is_active_next(ctx->net, chain))
1270                         continue;
1271
1272                 if (nft_chain_is_bound(chain))
1273                         continue;
1274
1275                 ctx->chain = chain;
1276
1277                 err = nft_delrule_by_chain(ctx);
1278                 if (err < 0)
1279                         goto out;
1280         }
1281
1282         list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
1283                 if (!nft_is_active_next(ctx->net, set))
1284                         continue;
1285
1286                 if (nft_set_is_anonymous(set) &&
1287                     !list_empty(&set->bindings))
1288                         continue;
1289
1290                 err = nft_delset(ctx, set);
1291                 if (err < 0)
1292                         goto out;
1293         }
1294
1295         list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
1296                 if (!nft_is_active_next(ctx->net, flowtable))
1297                         continue;
1298
1299                 err = nft_delflowtable(ctx, flowtable);
1300                 if (err < 0)
1301                         goto out;
1302         }
1303
1304         list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
1305                 if (!nft_is_active_next(ctx->net, obj))
1306                         continue;
1307
1308                 err = nft_delobj(ctx, obj);
1309                 if (err < 0)
1310                         goto out;
1311         }
1312
1313         list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
1314                 if (!nft_is_active_next(ctx->net, chain))
1315                         continue;
1316
1317                 if (nft_chain_is_bound(chain))
1318                         continue;
1319
1320                 ctx->chain = chain;
1321
1322                 err = nft_delchain(ctx);
1323                 if (err < 0)
1324                         goto out;
1325         }
1326
1327         err = nft_deltable(ctx);
1328 out:
1329         return err;
1330 }
1331
1332 static int nft_flush(struct nft_ctx *ctx, int family)
1333 {
1334         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
1335         const struct nlattr * const *nla = ctx->nla;
1336         struct nft_table *table, *nt;
1337         int err = 0;
1338
1339         list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
1340                 if (family != AF_UNSPEC && table->family != family)
1341                         continue;
1342
1343                 ctx->family = table->family;
1344
1345                 if (!nft_is_active_next(ctx->net, table))
1346                         continue;
1347
1348                 if (nft_table_has_owner(table) && table->nlpid != ctx->portid)
1349                         continue;
1350
1351                 if (nla[NFTA_TABLE_NAME] &&
1352                     nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
1353                         continue;
1354
1355                 ctx->table = table;
1356
1357                 err = nft_flush_table(ctx);
1358                 if (err < 0)
1359                         goto out;
1360         }
1361 out:
1362         return err;
1363 }
1364
1365 static int nf_tables_deltable(struct sk_buff *skb, const struct nfnl_info *info,
1366                               const struct nlattr * const nla[])
1367 {
1368         struct netlink_ext_ack *extack = info->extack;
1369         u8 genmask = nft_genmask_next(info->net);
1370         u8 family = info->nfmsg->nfgen_family;
1371         struct net *net = info->net;
1372         const struct nlattr *attr;
1373         struct nft_table *table;
1374         struct nft_ctx ctx;
1375
1376         nft_ctx_init(&ctx, net, skb, info->nlh, 0, NULL, NULL, nla);
1377         if (family == AF_UNSPEC ||
1378             (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
1379                 return nft_flush(&ctx, family);
1380
1381         if (nla[NFTA_TABLE_HANDLE]) {
1382                 attr = nla[NFTA_TABLE_HANDLE];
1383                 table = nft_table_lookup_byhandle(net, attr, genmask,
1384                                                   NETLINK_CB(skb).portid);
1385         } else {
1386                 attr = nla[NFTA_TABLE_NAME];
1387                 table = nft_table_lookup(net, attr, family, genmask,
1388                                          NETLINK_CB(skb).portid);
1389         }
1390
1391         if (IS_ERR(table)) {
1392                 NL_SET_BAD_ATTR(extack, attr);
1393                 return PTR_ERR(table);
1394         }
1395
1396         if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
1397             table->use > 0)
1398                 return -EBUSY;
1399
1400         ctx.family = family;
1401         ctx.table = table;
1402
1403         return nft_flush_table(&ctx);
1404 }
1405
1406 static void nf_tables_table_destroy(struct nft_ctx *ctx)
1407 {
1408         if (WARN_ON(ctx->table->use > 0))
1409                 return;
1410
1411         rhltable_destroy(&ctx->table->chains_ht);
1412         kfree(ctx->table->name);
1413         kfree(ctx->table->udata);
1414         kfree(ctx->table);
1415 }
1416
1417 void nft_register_chain_type(const struct nft_chain_type *ctype)
1418 {
1419         nfnl_lock(NFNL_SUBSYS_NFTABLES);
1420         if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) {
1421                 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1422                 return;
1423         }
1424         chain_type[ctype->family][ctype->type] = ctype;
1425         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1426 }
1427 EXPORT_SYMBOL_GPL(nft_register_chain_type);
1428
1429 void nft_unregister_chain_type(const struct nft_chain_type *ctype)
1430 {
1431         nfnl_lock(NFNL_SUBSYS_NFTABLES);
1432         chain_type[ctype->family][ctype->type] = NULL;
1433         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1434 }
1435 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
1436
1437 /*
1438  * Chains
1439  */
1440
1441 static struct nft_chain *
1442 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
1443 {
1444         struct nft_chain *chain;
1445
1446         list_for_each_entry(chain, &table->chains, list) {
1447                 if (chain->handle == handle &&
1448                     nft_active_genmask(chain, genmask))
1449                         return chain;
1450         }
1451
1452         return ERR_PTR(-ENOENT);
1453 }
1454
1455 static bool lockdep_commit_lock_is_held(const struct net *net)
1456 {
1457 #ifdef CONFIG_PROVE_LOCKING
1458         struct nftables_pernet *nft_net = nft_pernet(net);
1459
1460         return lockdep_is_held(&nft_net->commit_mutex);
1461 #else
1462         return true;
1463 #endif
1464 }
1465
1466 static struct nft_chain *nft_chain_lookup(struct net *net,
1467                                           struct nft_table *table,
1468                                           const struct nlattr *nla, u8 genmask)
1469 {
1470         char search[NFT_CHAIN_MAXNAMELEN + 1];
1471         struct rhlist_head *tmp, *list;
1472         struct nft_chain *chain;
1473
1474         if (nla == NULL)
1475                 return ERR_PTR(-EINVAL);
1476
1477         nla_strscpy(search, nla, sizeof(search));
1478
1479         WARN_ON(!rcu_read_lock_held() &&
1480                 !lockdep_commit_lock_is_held(net));
1481
1482         chain = ERR_PTR(-ENOENT);
1483         rcu_read_lock();
1484         list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1485         if (!list)
1486                 goto out_unlock;
1487
1488         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1489                 if (nft_active_genmask(chain, genmask))
1490                         goto out_unlock;
1491         }
1492         chain = ERR_PTR(-ENOENT);
1493 out_unlock:
1494         rcu_read_unlock();
1495         return chain;
1496 }
1497
1498 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1499         [NFTA_CHAIN_TABLE]      = { .type = NLA_STRING,
1500                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
1501         [NFTA_CHAIN_HANDLE]     = { .type = NLA_U64 },
1502         [NFTA_CHAIN_NAME]       = { .type = NLA_STRING,
1503                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
1504         [NFTA_CHAIN_HOOK]       = { .type = NLA_NESTED },
1505         [NFTA_CHAIN_POLICY]     = { .type = NLA_U32 },
1506         [NFTA_CHAIN_TYPE]       = { .type = NLA_STRING,
1507                                     .len = NFT_MODULE_AUTOLOAD_LIMIT },
1508         [NFTA_CHAIN_COUNTERS]   = { .type = NLA_NESTED },
1509         [NFTA_CHAIN_FLAGS]      = { .type = NLA_U32 },
1510         [NFTA_CHAIN_ID]         = { .type = NLA_U32 },
1511         [NFTA_CHAIN_USERDATA]   = { .type = NLA_BINARY,
1512                                     .len = NFT_USERDATA_MAXLEN },
1513 };
1514
1515 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1516         [NFTA_HOOK_HOOKNUM]     = { .type = NLA_U32 },
1517         [NFTA_HOOK_PRIORITY]    = { .type = NLA_U32 },
1518         [NFTA_HOOK_DEV]         = { .type = NLA_STRING,
1519                                     .len = IFNAMSIZ - 1 },
1520 };
1521
1522 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1523 {
1524         struct nft_stats *cpu_stats, total;
1525         struct nlattr *nest;
1526         unsigned int seq;
1527         u64 pkts, bytes;
1528         int cpu;
1529
1530         if (!stats)
1531                 return 0;
1532
1533         memset(&total, 0, sizeof(total));
1534         for_each_possible_cpu(cpu) {
1535                 cpu_stats = per_cpu_ptr(stats, cpu);
1536                 do {
1537                         seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
1538                         pkts = cpu_stats->pkts;
1539                         bytes = cpu_stats->bytes;
1540                 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
1541                 total.pkts += pkts;
1542                 total.bytes += bytes;
1543         }
1544         nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS);
1545         if (nest == NULL)
1546                 goto nla_put_failure;
1547
1548         if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1549                          NFTA_COUNTER_PAD) ||
1550             nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1551                          NFTA_COUNTER_PAD))
1552                 goto nla_put_failure;
1553
1554         nla_nest_end(skb, nest);
1555         return 0;
1556
1557 nla_put_failure:
1558         return -ENOSPC;
1559 }
1560
1561 static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
1562                                    const struct nft_base_chain *basechain)
1563 {
1564         const struct nf_hook_ops *ops = &basechain->ops;
1565         struct nft_hook *hook, *first = NULL;
1566         struct nlattr *nest, *nest_devs;
1567         int n = 0;
1568
1569         nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK);
1570         if (nest == NULL)
1571                 goto nla_put_failure;
1572         if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1573                 goto nla_put_failure;
1574         if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1575                 goto nla_put_failure;
1576
1577         if (nft_base_chain_netdev(family, ops->hooknum)) {
1578                 nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS);
1579                 list_for_each_entry(hook, &basechain->hook_list, list) {
1580                         if (!first)
1581                                 first = hook;
1582
1583                         if (nla_put_string(skb, NFTA_DEVICE_NAME,
1584                                            hook->ops.dev->name))
1585                                 goto nla_put_failure;
1586                         n++;
1587                 }
1588                 nla_nest_end(skb, nest_devs);
1589
1590                 if (n == 1 &&
1591                     nla_put_string(skb, NFTA_HOOK_DEV, first->ops.dev->name))
1592                         goto nla_put_failure;
1593         }
1594         nla_nest_end(skb, nest);
1595
1596         return 0;
1597 nla_put_failure:
1598         return -1;
1599 }
1600
1601 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1602                                      u32 portid, u32 seq, int event, u32 flags,
1603                                      int family, const struct nft_table *table,
1604                                      const struct nft_chain *chain)
1605 {
1606         struct nlmsghdr *nlh;
1607
1608         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1609         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
1610                            NFNETLINK_V0, nft_base_seq(net));
1611         if (!nlh)
1612                 goto nla_put_failure;
1613
1614         if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
1615                 goto nla_put_failure;
1616         if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1617                          NFTA_CHAIN_PAD))
1618                 goto nla_put_failure;
1619         if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
1620                 goto nla_put_failure;
1621
1622         if (nft_is_base_chain(chain)) {
1623                 const struct nft_base_chain *basechain = nft_base_chain(chain);
1624                 struct nft_stats __percpu *stats;
1625
1626                 if (nft_dump_basechain_hook(skb, family, basechain))
1627                         goto nla_put_failure;
1628
1629                 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1630                                  htonl(basechain->policy)))
1631                         goto nla_put_failure;
1632
1633                 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1634                         goto nla_put_failure;
1635
1636                 stats = rcu_dereference_check(basechain->stats,
1637                                               lockdep_commit_lock_is_held(net));
1638                 if (nft_dump_stats(skb, stats))
1639                         goto nla_put_failure;
1640         }
1641
1642         if (chain->flags &&
1643             nla_put_be32(skb, NFTA_CHAIN_FLAGS, htonl(chain->flags)))
1644                 goto nla_put_failure;
1645
1646         if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1647                 goto nla_put_failure;
1648
1649         if (chain->udata &&
1650             nla_put(skb, NFTA_CHAIN_USERDATA, chain->udlen, chain->udata))
1651                 goto nla_put_failure;
1652
1653         nlmsg_end(skb, nlh);
1654         return 0;
1655
1656 nla_put_failure:
1657         nlmsg_trim(skb, nlh);
1658         return -1;
1659 }
1660
1661 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
1662 {
1663         struct nftables_pernet *nft_net;
1664         struct sk_buff *skb;
1665         u16 flags = 0;
1666         int err;
1667
1668         if (!ctx->report &&
1669             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1670                 return;
1671
1672         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1673         if (skb == NULL)
1674                 goto err;
1675
1676         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
1677                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
1678
1679         err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1680                                         event, flags, ctx->family, ctx->table,
1681                                         ctx->chain);
1682         if (err < 0) {
1683                 kfree_skb(skb);
1684                 goto err;
1685         }
1686
1687         nft_net = nft_pernet(ctx->net);
1688         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
1689         return;
1690 err:
1691         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1692 }
1693
1694 static int nf_tables_dump_chains(struct sk_buff *skb,
1695                                  struct netlink_callback *cb)
1696 {
1697         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1698         unsigned int idx = 0, s_idx = cb->args[0];
1699         struct net *net = sock_net(skb->sk);
1700         int family = nfmsg->nfgen_family;
1701         struct nftables_pernet *nft_net;
1702         const struct nft_table *table;
1703         const struct nft_chain *chain;
1704
1705         rcu_read_lock();
1706         nft_net = nft_pernet(net);
1707         cb->seq = READ_ONCE(nft_net->base_seq);
1708
1709         list_for_each_entry_rcu(table, &nft_net->tables, list) {
1710                 if (family != NFPROTO_UNSPEC && family != table->family)
1711                         continue;
1712
1713                 list_for_each_entry_rcu(chain, &table->chains, list) {
1714                         if (idx < s_idx)
1715                                 goto cont;
1716                         if (idx > s_idx)
1717                                 memset(&cb->args[1], 0,
1718                                        sizeof(cb->args) - sizeof(cb->args[0]));
1719                         if (!nft_is_active(net, chain))
1720                                 continue;
1721                         if (nf_tables_fill_chain_info(skb, net,
1722                                                       NETLINK_CB(cb->skb).portid,
1723                                                       cb->nlh->nlmsg_seq,
1724                                                       NFT_MSG_NEWCHAIN,
1725                                                       NLM_F_MULTI,
1726                                                       table->family, table,
1727                                                       chain) < 0)
1728                                 goto done;
1729
1730                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1731 cont:
1732                         idx++;
1733                 }
1734         }
1735 done:
1736         rcu_read_unlock();
1737         cb->args[0] = idx;
1738         return skb->len;
1739 }
1740
1741 /* called with rcu_read_lock held */
1742 static int nf_tables_getchain(struct sk_buff *skb, const struct nfnl_info *info,
1743                               const struct nlattr * const nla[])
1744 {
1745         struct netlink_ext_ack *extack = info->extack;
1746         u8 genmask = nft_genmask_cur(info->net);
1747         u8 family = info->nfmsg->nfgen_family;
1748         const struct nft_chain *chain;
1749         struct net *net = info->net;
1750         struct nft_table *table;
1751         struct sk_buff *skb2;
1752         int err;
1753
1754         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1755                 struct netlink_dump_control c = {
1756                         .dump = nf_tables_dump_chains,
1757                         .module = THIS_MODULE,
1758                 };
1759
1760                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
1761         }
1762
1763         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask, 0);
1764         if (IS_ERR(table)) {
1765                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1766                 return PTR_ERR(table);
1767         }
1768
1769         chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
1770         if (IS_ERR(chain)) {
1771                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
1772                 return PTR_ERR(chain);
1773         }
1774
1775         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1776         if (!skb2)
1777                 return -ENOMEM;
1778
1779         err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1780                                         info->nlh->nlmsg_seq, NFT_MSG_NEWCHAIN,
1781                                         0, family, table, chain);
1782         if (err < 0)
1783                 goto err_fill_chain_info;
1784
1785         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1786
1787 err_fill_chain_info:
1788         kfree_skb(skb2);
1789         return err;
1790 }
1791
1792 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1793         [NFTA_COUNTER_PACKETS]  = { .type = NLA_U64 },
1794         [NFTA_COUNTER_BYTES]    = { .type = NLA_U64 },
1795 };
1796
1797 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1798 {
1799         struct nlattr *tb[NFTA_COUNTER_MAX+1];
1800         struct nft_stats __percpu *newstats;
1801         struct nft_stats *stats;
1802         int err;
1803
1804         err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr,
1805                                           nft_counter_policy, NULL);
1806         if (err < 0)
1807                 return ERR_PTR(err);
1808
1809         if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1810                 return ERR_PTR(-EINVAL);
1811
1812         newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1813         if (newstats == NULL)
1814                 return ERR_PTR(-ENOMEM);
1815
1816         /* Restore old counters on this cpu, no problem. Per-cpu statistics
1817          * are not exposed to userspace.
1818          */
1819         preempt_disable();
1820         stats = this_cpu_ptr(newstats);
1821         stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1822         stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1823         preempt_enable();
1824
1825         return newstats;
1826 }
1827
1828 static void nft_chain_stats_replace(struct nft_trans *trans)
1829 {
1830         struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain);
1831
1832         if (!nft_trans_chain_stats(trans))
1833                 return;
1834
1835         nft_trans_chain_stats(trans) =
1836                 rcu_replace_pointer(chain->stats, nft_trans_chain_stats(trans),
1837                                     lockdep_commit_lock_is_held(trans->ctx.net));
1838
1839         if (!nft_trans_chain_stats(trans))
1840                 static_branch_inc(&nft_counters_enabled);
1841 }
1842
1843 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
1844 {
1845         struct nft_rule_blob *g0 = rcu_dereference_raw(chain->blob_gen_0);
1846         struct nft_rule_blob *g1 = rcu_dereference_raw(chain->blob_gen_1);
1847
1848         if (g0 != g1)
1849                 kvfree(g1);
1850         kvfree(g0);
1851
1852         /* should be NULL either via abort or via successful commit */
1853         WARN_ON_ONCE(chain->blob_next);
1854         kvfree(chain->blob_next);
1855 }
1856
1857 void nf_tables_chain_destroy(struct nft_ctx *ctx)
1858 {
1859         struct nft_chain *chain = ctx->chain;
1860         struct nft_hook *hook, *next;
1861
1862         if (WARN_ON(chain->use > 0))
1863                 return;
1864
1865         /* no concurrent access possible anymore */
1866         nf_tables_chain_free_chain_rules(chain);
1867
1868         if (nft_is_base_chain(chain)) {
1869                 struct nft_base_chain *basechain = nft_base_chain(chain);
1870
1871                 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
1872                         list_for_each_entry_safe(hook, next,
1873                                                  &basechain->hook_list, list) {
1874                                 list_del_rcu(&hook->list);
1875                                 kfree_rcu(hook, rcu);
1876                         }
1877                 }
1878                 module_put(basechain->type->owner);
1879                 if (rcu_access_pointer(basechain->stats)) {
1880                         static_branch_dec(&nft_counters_enabled);
1881                         free_percpu(rcu_dereference_raw(basechain->stats));
1882                 }
1883                 kfree(chain->name);
1884                 kfree(chain->udata);
1885                 kfree(basechain);
1886         } else {
1887                 kfree(chain->name);
1888                 kfree(chain->udata);
1889                 kfree(chain);
1890         }
1891 }
1892
1893 static struct nft_hook *nft_netdev_hook_alloc(struct net *net,
1894                                               const struct nlattr *attr)
1895 {
1896         struct net_device *dev;
1897         char ifname[IFNAMSIZ];
1898         struct nft_hook *hook;
1899         int err;
1900
1901         hook = kmalloc(sizeof(struct nft_hook), GFP_KERNEL_ACCOUNT);
1902         if (!hook) {
1903                 err = -ENOMEM;
1904                 goto err_hook_alloc;
1905         }
1906
1907         nla_strscpy(ifname, attr, IFNAMSIZ);
1908         /* nf_tables_netdev_event() is called under rtnl_mutex, this is
1909          * indirectly serializing all the other holders of the commit_mutex with
1910          * the rtnl_mutex.
1911          */
1912         dev = __dev_get_by_name(net, ifname);
1913         if (!dev) {
1914                 err = -ENOENT;
1915                 goto err_hook_dev;
1916         }
1917         hook->ops.dev = dev;
1918
1919         return hook;
1920
1921 err_hook_dev:
1922         kfree(hook);
1923 err_hook_alloc:
1924         return ERR_PTR(err);
1925 }
1926
1927 static struct nft_hook *nft_hook_list_find(struct list_head *hook_list,
1928                                            const struct nft_hook *this)
1929 {
1930         struct nft_hook *hook;
1931
1932         list_for_each_entry(hook, hook_list, list) {
1933                 if (this->ops.dev == hook->ops.dev)
1934                         return hook;
1935         }
1936
1937         return NULL;
1938 }
1939
1940 static int nf_tables_parse_netdev_hooks(struct net *net,
1941                                         const struct nlattr *attr,
1942                                         struct list_head *hook_list)
1943 {
1944         struct nft_hook *hook, *next;
1945         const struct nlattr *tmp;
1946         int rem, n = 0, err;
1947
1948         nla_for_each_nested(tmp, attr, rem) {
1949                 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
1950                         err = -EINVAL;
1951                         goto err_hook;
1952                 }
1953
1954                 hook = nft_netdev_hook_alloc(net, tmp);
1955                 if (IS_ERR(hook)) {
1956                         err = PTR_ERR(hook);
1957                         goto err_hook;
1958                 }
1959                 if (nft_hook_list_find(hook_list, hook)) {
1960                         kfree(hook);
1961                         err = -EEXIST;
1962                         goto err_hook;
1963                 }
1964                 list_add_tail(&hook->list, hook_list);
1965                 n++;
1966
1967                 if (n == NFT_NETDEVICE_MAX) {
1968                         err = -EFBIG;
1969                         goto err_hook;
1970                 }
1971         }
1972
1973         return 0;
1974
1975 err_hook:
1976         list_for_each_entry_safe(hook, next, hook_list, list) {
1977                 list_del(&hook->list);
1978                 kfree(hook);
1979         }
1980         return err;
1981 }
1982
1983 struct nft_chain_hook {
1984         u32                             num;
1985         s32                             priority;
1986         const struct nft_chain_type     *type;
1987         struct list_head                list;
1988 };
1989
1990 static int nft_chain_parse_netdev(struct net *net,
1991                                   struct nlattr *tb[],
1992                                   struct list_head *hook_list)
1993 {
1994         struct nft_hook *hook;
1995         int err;
1996
1997         if (tb[NFTA_HOOK_DEV]) {
1998                 hook = nft_netdev_hook_alloc(net, tb[NFTA_HOOK_DEV]);
1999                 if (IS_ERR(hook))
2000                         return PTR_ERR(hook);
2001
2002                 list_add_tail(&hook->list, hook_list);
2003         } else if (tb[NFTA_HOOK_DEVS]) {
2004                 err = nf_tables_parse_netdev_hooks(net, tb[NFTA_HOOK_DEVS],
2005                                                    hook_list);
2006                 if (err < 0)
2007                         return err;
2008
2009                 if (list_empty(hook_list))
2010                         return -EINVAL;
2011         } else {
2012                 return -EINVAL;
2013         }
2014
2015         return 0;
2016 }
2017
2018 static int nft_chain_parse_hook(struct net *net,
2019                                 const struct nlattr * const nla[],
2020                                 struct nft_chain_hook *hook, u8 family,
2021                                 struct netlink_ext_ack *extack, bool autoload)
2022 {
2023         struct nftables_pernet *nft_net = nft_pernet(net);
2024         struct nlattr *ha[NFTA_HOOK_MAX + 1];
2025         const struct nft_chain_type *type;
2026         int err;
2027
2028         lockdep_assert_held(&nft_net->commit_mutex);
2029         lockdep_nfnl_nft_mutex_not_held();
2030
2031         err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX,
2032                                           nla[NFTA_CHAIN_HOOK],
2033                                           nft_hook_policy, NULL);
2034         if (err < 0)
2035                 return err;
2036
2037         if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
2038             ha[NFTA_HOOK_PRIORITY] == NULL)
2039                 return -EINVAL;
2040
2041         hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
2042         hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
2043
2044         type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
2045         if (!type)
2046                 return -EOPNOTSUPP;
2047
2048         if (nla[NFTA_CHAIN_TYPE]) {
2049                 type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
2050                                                    family, autoload);
2051                 if (IS_ERR(type)) {
2052                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2053                         return PTR_ERR(type);
2054                 }
2055         }
2056         if (hook->num >= NFT_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
2057                 return -EOPNOTSUPP;
2058
2059         if (type->type == NFT_CHAIN_T_NAT &&
2060             hook->priority <= NF_IP_PRI_CONNTRACK)
2061                 return -EOPNOTSUPP;
2062
2063         if (!try_module_get(type->owner)) {
2064                 if (nla[NFTA_CHAIN_TYPE])
2065                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2066                 return -ENOENT;
2067         }
2068
2069         hook->type = type;
2070
2071         INIT_LIST_HEAD(&hook->list);
2072         if (nft_base_chain_netdev(family, hook->num)) {
2073                 err = nft_chain_parse_netdev(net, ha, &hook->list);
2074                 if (err < 0) {
2075                         module_put(type->owner);
2076                         return err;
2077                 }
2078         } else if (ha[NFTA_HOOK_DEV] || ha[NFTA_HOOK_DEVS]) {
2079                 module_put(type->owner);
2080                 return -EOPNOTSUPP;
2081         }
2082
2083         return 0;
2084 }
2085
2086 static void nft_chain_release_hook(struct nft_chain_hook *hook)
2087 {
2088         struct nft_hook *h, *next;
2089
2090         list_for_each_entry_safe(h, next, &hook->list, list) {
2091                 list_del(&h->list);
2092                 kfree(h);
2093         }
2094         module_put(hook->type->owner);
2095 }
2096
2097 struct nft_rules_old {
2098         struct rcu_head h;
2099         struct nft_rule_blob *blob;
2100 };
2101
2102 static void nft_last_rule(struct nft_rule_blob *blob, const void *ptr)
2103 {
2104         struct nft_rule_dp *prule;
2105
2106         prule = (struct nft_rule_dp *)ptr;
2107         prule->is_last = 1;
2108         /* blob size does not include the trailer rule */
2109 }
2110
2111 static struct nft_rule_blob *nf_tables_chain_alloc_rules(unsigned int size)
2112 {
2113         struct nft_rule_blob *blob;
2114
2115         /* size must include room for the last rule */
2116         if (size < offsetof(struct nft_rule_dp, data))
2117                 return NULL;
2118
2119         size += sizeof(struct nft_rule_blob) + sizeof(struct nft_rules_old);
2120         if (size > INT_MAX)
2121                 return NULL;
2122
2123         blob = kvmalloc(size, GFP_KERNEL_ACCOUNT);
2124         if (!blob)
2125                 return NULL;
2126
2127         blob->size = 0;
2128         nft_last_rule(blob, blob->data);
2129
2130         return blob;
2131 }
2132
2133 static void nft_basechain_hook_init(struct nf_hook_ops *ops, u8 family,
2134                                     const struct nft_chain_hook *hook,
2135                                     struct nft_chain *chain)
2136 {
2137         ops->pf                 = family;
2138         ops->hooknum            = hook->num;
2139         ops->priority           = hook->priority;
2140         ops->priv               = chain;
2141         ops->hook               = hook->type->hooks[ops->hooknum];
2142         ops->hook_ops_type      = NF_HOOK_OP_NF_TABLES;
2143 }
2144
2145 static int nft_basechain_init(struct nft_base_chain *basechain, u8 family,
2146                               struct nft_chain_hook *hook, u32 flags)
2147 {
2148         struct nft_chain *chain;
2149         struct nft_hook *h;
2150
2151         basechain->type = hook->type;
2152         INIT_LIST_HEAD(&basechain->hook_list);
2153         chain = &basechain->chain;
2154
2155         if (nft_base_chain_netdev(family, hook->num)) {
2156                 list_splice_init(&hook->list, &basechain->hook_list);
2157                 list_for_each_entry(h, &basechain->hook_list, list)
2158                         nft_basechain_hook_init(&h->ops, family, hook, chain);
2159
2160                 basechain->ops.hooknum  = hook->num;
2161                 basechain->ops.priority = hook->priority;
2162         } else {
2163                 nft_basechain_hook_init(&basechain->ops, family, hook, chain);
2164         }
2165
2166         chain->flags |= NFT_CHAIN_BASE | flags;
2167         basechain->policy = NF_ACCEPT;
2168         if (chain->flags & NFT_CHAIN_HW_OFFLOAD &&
2169             !nft_chain_offload_support(basechain)) {
2170                 list_splice_init(&basechain->hook_list, &hook->list);
2171                 return -EOPNOTSUPP;
2172         }
2173
2174         flow_block_init(&basechain->flow_block);
2175
2176         return 0;
2177 }
2178
2179 static int nft_chain_add(struct nft_table *table, struct nft_chain *chain)
2180 {
2181         int err;
2182
2183         err = rhltable_insert_key(&table->chains_ht, chain->name,
2184                                   &chain->rhlhead, nft_chain_ht_params);
2185         if (err)
2186                 return err;
2187
2188         list_add_tail_rcu(&chain->list, &table->chains);
2189
2190         return 0;
2191 }
2192
2193 static u64 chain_id;
2194
2195 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
2196                               u8 policy, u32 flags,
2197                               struct netlink_ext_ack *extack)
2198 {
2199         const struct nlattr * const *nla = ctx->nla;
2200         struct nft_table *table = ctx->table;
2201         struct nft_base_chain *basechain;
2202         struct net *net = ctx->net;
2203         char name[NFT_NAME_MAXLEN];
2204         struct nft_rule_blob *blob;
2205         struct nft_trans *trans;
2206         struct nft_chain *chain;
2207         unsigned int data_size;
2208         int err;
2209
2210         if (table->use == UINT_MAX)
2211                 return -EOVERFLOW;
2212
2213         if (nla[NFTA_CHAIN_HOOK]) {
2214                 struct nft_stats __percpu *stats = NULL;
2215                 struct nft_chain_hook hook;
2216
2217                 if (flags & NFT_CHAIN_BINDING)
2218                         return -EOPNOTSUPP;
2219
2220                 err = nft_chain_parse_hook(net, nla, &hook, family, extack,
2221                                            true);
2222                 if (err < 0)
2223                         return err;
2224
2225                 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL_ACCOUNT);
2226                 if (basechain == NULL) {
2227                         nft_chain_release_hook(&hook);
2228                         return -ENOMEM;
2229                 }
2230                 chain = &basechain->chain;
2231
2232                 if (nla[NFTA_CHAIN_COUNTERS]) {
2233                         stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2234                         if (IS_ERR(stats)) {
2235                                 nft_chain_release_hook(&hook);
2236                                 kfree(basechain);
2237                                 return PTR_ERR(stats);
2238                         }
2239                         rcu_assign_pointer(basechain->stats, stats);
2240                 }
2241
2242                 err = nft_basechain_init(basechain, family, &hook, flags);
2243                 if (err < 0) {
2244                         nft_chain_release_hook(&hook);
2245                         kfree(basechain);
2246                         free_percpu(stats);
2247                         return err;
2248                 }
2249                 if (stats)
2250                         static_branch_inc(&nft_counters_enabled);
2251         } else {
2252                 if (flags & NFT_CHAIN_BASE)
2253                         return -EINVAL;
2254                 if (flags & NFT_CHAIN_HW_OFFLOAD)
2255                         return -EOPNOTSUPP;
2256
2257                 chain = kzalloc(sizeof(*chain), GFP_KERNEL_ACCOUNT);
2258                 if (chain == NULL)
2259                         return -ENOMEM;
2260
2261                 chain->flags = flags;
2262         }
2263         ctx->chain = chain;
2264
2265         INIT_LIST_HEAD(&chain->rules);
2266         chain->handle = nf_tables_alloc_handle(table);
2267         chain->table = table;
2268
2269         if (nla[NFTA_CHAIN_NAME]) {
2270                 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2271         } else {
2272                 if (!(flags & NFT_CHAIN_BINDING)) {
2273                         err = -EINVAL;
2274                         goto err_destroy_chain;
2275                 }
2276
2277                 snprintf(name, sizeof(name), "__chain%llu", ++chain_id);
2278                 chain->name = kstrdup(name, GFP_KERNEL_ACCOUNT);
2279         }
2280
2281         if (!chain->name) {
2282                 err = -ENOMEM;
2283                 goto err_destroy_chain;
2284         }
2285
2286         if (nla[NFTA_CHAIN_USERDATA]) {
2287                 chain->udata = nla_memdup(nla[NFTA_CHAIN_USERDATA], GFP_KERNEL_ACCOUNT);
2288                 if (chain->udata == NULL) {
2289                         err = -ENOMEM;
2290                         goto err_destroy_chain;
2291                 }
2292                 chain->udlen = nla_len(nla[NFTA_CHAIN_USERDATA]);
2293         }
2294
2295         data_size = offsetof(struct nft_rule_dp, data); /* last rule */
2296         blob = nf_tables_chain_alloc_rules(data_size);
2297         if (!blob) {
2298                 err = -ENOMEM;
2299                 goto err_destroy_chain;
2300         }
2301
2302         RCU_INIT_POINTER(chain->blob_gen_0, blob);
2303         RCU_INIT_POINTER(chain->blob_gen_1, blob);
2304
2305         err = nf_tables_register_hook(net, table, chain);
2306         if (err < 0)
2307                 goto err_destroy_chain;
2308
2309         trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
2310         if (IS_ERR(trans)) {
2311                 err = PTR_ERR(trans);
2312                 goto err_unregister_hook;
2313         }
2314
2315         nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET;
2316         if (nft_is_base_chain(chain))
2317                 nft_trans_chain_policy(trans) = policy;
2318
2319         err = nft_chain_add(table, chain);
2320         if (err < 0) {
2321                 nft_trans_destroy(trans);
2322                 goto err_unregister_hook;
2323         }
2324
2325         table->use++;
2326
2327         return 0;
2328 err_unregister_hook:
2329         nf_tables_unregister_hook(net, table, chain);
2330 err_destroy_chain:
2331         nf_tables_chain_destroy(ctx);
2332
2333         return err;
2334 }
2335
2336 static bool nft_hook_list_equal(struct list_head *hook_list1,
2337                                 struct list_head *hook_list2)
2338 {
2339         struct nft_hook *hook;
2340         int n = 0, m = 0;
2341
2342         n = 0;
2343         list_for_each_entry(hook, hook_list2, list) {
2344                 if (!nft_hook_list_find(hook_list1, hook))
2345                         return false;
2346
2347                 n++;
2348         }
2349         list_for_each_entry(hook, hook_list1, list)
2350                 m++;
2351
2352         return n == m;
2353 }
2354
2355 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
2356                               u32 flags, const struct nlattr *attr,
2357                               struct netlink_ext_ack *extack)
2358 {
2359         const struct nlattr * const *nla = ctx->nla;
2360         struct nft_table *table = ctx->table;
2361         struct nft_chain *chain = ctx->chain;
2362         struct nft_base_chain *basechain;
2363         struct nft_stats *stats = NULL;
2364         struct nft_chain_hook hook;
2365         struct nf_hook_ops *ops;
2366         struct nft_trans *trans;
2367         int err;
2368
2369         if (chain->flags ^ flags)
2370                 return -EOPNOTSUPP;
2371
2372         if (nla[NFTA_CHAIN_HOOK]) {
2373                 if (!nft_is_base_chain(chain)) {
2374                         NL_SET_BAD_ATTR(extack, attr);
2375                         return -EEXIST;
2376                 }
2377                 err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family,
2378                                            extack, false);
2379                 if (err < 0)
2380                         return err;
2381
2382                 basechain = nft_base_chain(chain);
2383                 if (basechain->type != hook.type) {
2384                         nft_chain_release_hook(&hook);
2385                         NL_SET_BAD_ATTR(extack, attr);
2386                         return -EEXIST;
2387                 }
2388
2389                 if (nft_base_chain_netdev(ctx->family, hook.num)) {
2390                         if (!nft_hook_list_equal(&basechain->hook_list,
2391                                                  &hook.list)) {
2392                                 nft_chain_release_hook(&hook);
2393                                 NL_SET_BAD_ATTR(extack, attr);
2394                                 return -EEXIST;
2395                         }
2396                 } else {
2397                         ops = &basechain->ops;
2398                         if (ops->hooknum != hook.num ||
2399                             ops->priority != hook.priority) {
2400                                 nft_chain_release_hook(&hook);
2401                                 NL_SET_BAD_ATTR(extack, attr);
2402                                 return -EEXIST;
2403                         }
2404                 }
2405                 nft_chain_release_hook(&hook);
2406         }
2407
2408         if (nla[NFTA_CHAIN_HANDLE] &&
2409             nla[NFTA_CHAIN_NAME]) {
2410                 struct nft_chain *chain2;
2411
2412                 chain2 = nft_chain_lookup(ctx->net, table,
2413                                           nla[NFTA_CHAIN_NAME], genmask);
2414                 if (!IS_ERR(chain2)) {
2415                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2416                         return -EEXIST;
2417                 }
2418         }
2419
2420         if (nla[NFTA_CHAIN_COUNTERS]) {
2421                 if (!nft_is_base_chain(chain))
2422                         return -EOPNOTSUPP;
2423
2424                 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2425                 if (IS_ERR(stats))
2426                         return PTR_ERR(stats);
2427         }
2428
2429         err = -ENOMEM;
2430         trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
2431                                 sizeof(struct nft_trans_chain));
2432         if (trans == NULL)
2433                 goto err;
2434
2435         nft_trans_chain_stats(trans) = stats;
2436         nft_trans_chain_update(trans) = true;
2437
2438         if (nla[NFTA_CHAIN_POLICY])
2439                 nft_trans_chain_policy(trans) = policy;
2440         else
2441                 nft_trans_chain_policy(trans) = -1;
2442
2443         if (nla[NFTA_CHAIN_HANDLE] &&
2444             nla[NFTA_CHAIN_NAME]) {
2445                 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
2446                 struct nft_trans *tmp;
2447                 char *name;
2448
2449                 err = -ENOMEM;
2450                 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2451                 if (!name)
2452                         goto err;
2453
2454                 err = -EEXIST;
2455                 list_for_each_entry(tmp, &nft_net->commit_list, list) {
2456                         if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
2457                             tmp->ctx.table == table &&
2458                             nft_trans_chain_update(tmp) &&
2459                             nft_trans_chain_name(tmp) &&
2460                             strcmp(name, nft_trans_chain_name(tmp)) == 0) {
2461                                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2462                                 kfree(name);
2463                                 goto err;
2464                         }
2465                 }
2466
2467                 nft_trans_chain_name(trans) = name;
2468         }
2469         nft_trans_commit_list_add_tail(ctx->net, trans);
2470
2471         return 0;
2472 err:
2473         free_percpu(stats);
2474         kfree(trans);
2475         return err;
2476 }
2477
2478 static struct nft_chain *nft_chain_lookup_byid(const struct net *net,
2479                                                const struct nft_table *table,
2480                                                const struct nlattr *nla)
2481 {
2482         struct nftables_pernet *nft_net = nft_pernet(net);
2483         u32 id = ntohl(nla_get_be32(nla));
2484         struct nft_trans *trans;
2485
2486         list_for_each_entry(trans, &nft_net->commit_list, list) {
2487                 struct nft_chain *chain = trans->ctx.chain;
2488
2489                 if (trans->msg_type == NFT_MSG_NEWCHAIN &&
2490                     chain->table == table &&
2491                     id == nft_trans_chain_id(trans))
2492                         return chain;
2493         }
2494         return ERR_PTR(-ENOENT);
2495 }
2496
2497 static int nf_tables_newchain(struct sk_buff *skb, const struct nfnl_info *info,
2498                               const struct nlattr * const nla[])
2499 {
2500         struct nftables_pernet *nft_net = nft_pernet(info->net);
2501         struct netlink_ext_ack *extack = info->extack;
2502         u8 genmask = nft_genmask_next(info->net);
2503         u8 family = info->nfmsg->nfgen_family;
2504         struct nft_chain *chain = NULL;
2505         struct net *net = info->net;
2506         const struct nlattr *attr;
2507         struct nft_table *table;
2508         u8 policy = NF_ACCEPT;
2509         struct nft_ctx ctx;
2510         u64 handle = 0;
2511         u32 flags = 0;
2512
2513         lockdep_assert_held(&nft_net->commit_mutex);
2514
2515         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2516                                  NETLINK_CB(skb).portid);
2517         if (IS_ERR(table)) {
2518                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2519                 return PTR_ERR(table);
2520         }
2521
2522         chain = NULL;
2523         attr = nla[NFTA_CHAIN_NAME];
2524
2525         if (nla[NFTA_CHAIN_HANDLE]) {
2526                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
2527                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2528                 if (IS_ERR(chain)) {
2529                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
2530                         return PTR_ERR(chain);
2531                 }
2532                 attr = nla[NFTA_CHAIN_HANDLE];
2533         } else if (nla[NFTA_CHAIN_NAME]) {
2534                 chain = nft_chain_lookup(net, table, attr, genmask);
2535                 if (IS_ERR(chain)) {
2536                         if (PTR_ERR(chain) != -ENOENT) {
2537                                 NL_SET_BAD_ATTR(extack, attr);
2538                                 return PTR_ERR(chain);
2539                         }
2540                         chain = NULL;
2541                 }
2542         } else if (!nla[NFTA_CHAIN_ID]) {
2543                 return -EINVAL;
2544         }
2545
2546         if (nla[NFTA_CHAIN_POLICY]) {
2547                 if (chain != NULL &&
2548                     !nft_is_base_chain(chain)) {
2549                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2550                         return -EOPNOTSUPP;
2551                 }
2552
2553                 if (chain == NULL &&
2554                     nla[NFTA_CHAIN_HOOK] == NULL) {
2555                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2556                         return -EOPNOTSUPP;
2557                 }
2558
2559                 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
2560                 switch (policy) {
2561                 case NF_DROP:
2562                 case NF_ACCEPT:
2563                         break;
2564                 default:
2565                         return -EINVAL;
2566                 }
2567         }
2568
2569         if (nla[NFTA_CHAIN_FLAGS])
2570                 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
2571         else if (chain)
2572                 flags = chain->flags;
2573
2574         if (flags & ~NFT_CHAIN_FLAGS)
2575                 return -EOPNOTSUPP;
2576
2577         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2578
2579         if (chain != NULL) {
2580                 if (chain->flags & NFT_CHAIN_BINDING)
2581                         return -EINVAL;
2582
2583                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
2584                         NL_SET_BAD_ATTR(extack, attr);
2585                         return -EEXIST;
2586                 }
2587                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
2588                         return -EOPNOTSUPP;
2589
2590                 flags |= chain->flags & NFT_CHAIN_BASE;
2591                 return nf_tables_updchain(&ctx, genmask, policy, flags, attr,
2592                                           extack);
2593         }
2594
2595         return nf_tables_addchain(&ctx, family, genmask, policy, flags, extack);
2596 }
2597
2598 static int nf_tables_delchain(struct sk_buff *skb, const struct nfnl_info *info,
2599                               const struct nlattr * const nla[])
2600 {
2601         struct netlink_ext_ack *extack = info->extack;
2602         u8 genmask = nft_genmask_next(info->net);
2603         u8 family = info->nfmsg->nfgen_family;
2604         struct net *net = info->net;
2605         const struct nlattr *attr;
2606         struct nft_table *table;
2607         struct nft_chain *chain;
2608         struct nft_rule *rule;
2609         struct nft_ctx ctx;
2610         u64 handle;
2611         u32 use;
2612         int err;
2613
2614         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2615                                  NETLINK_CB(skb).portid);
2616         if (IS_ERR(table)) {
2617                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2618                 return PTR_ERR(table);
2619         }
2620
2621         if (nla[NFTA_CHAIN_HANDLE]) {
2622                 attr = nla[NFTA_CHAIN_HANDLE];
2623                 handle = be64_to_cpu(nla_get_be64(attr));
2624                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2625         } else {
2626                 attr = nla[NFTA_CHAIN_NAME];
2627                 chain = nft_chain_lookup(net, table, attr, genmask);
2628         }
2629         if (IS_ERR(chain)) {
2630                 NL_SET_BAD_ATTR(extack, attr);
2631                 return PTR_ERR(chain);
2632         }
2633
2634         if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
2635             chain->use > 0)
2636                 return -EBUSY;
2637
2638         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2639
2640         use = chain->use;
2641         list_for_each_entry(rule, &chain->rules, list) {
2642                 if (!nft_is_active_next(net, rule))
2643                         continue;
2644                 use--;
2645
2646                 err = nft_delrule(&ctx, rule);
2647                 if (err < 0)
2648                         return err;
2649         }
2650
2651         /* There are rules and elements that are still holding references to us,
2652          * we cannot do a recursive removal in this case.
2653          */
2654         if (use > 0) {
2655                 NL_SET_BAD_ATTR(extack, attr);
2656                 return -EBUSY;
2657         }
2658
2659         return nft_delchain(&ctx);
2660 }
2661
2662 /*
2663  * Expressions
2664  */
2665
2666 /**
2667  *      nft_register_expr - register nf_tables expr type
2668  *      @type: expr type
2669  *
2670  *      Registers the expr type for use with nf_tables. Returns zero on
2671  *      success or a negative errno code otherwise.
2672  */
2673 int nft_register_expr(struct nft_expr_type *type)
2674 {
2675         nfnl_lock(NFNL_SUBSYS_NFTABLES);
2676         if (type->family == NFPROTO_UNSPEC)
2677                 list_add_tail_rcu(&type->list, &nf_tables_expressions);
2678         else
2679                 list_add_rcu(&type->list, &nf_tables_expressions);
2680         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2681         return 0;
2682 }
2683 EXPORT_SYMBOL_GPL(nft_register_expr);
2684
2685 /**
2686  *      nft_unregister_expr - unregister nf_tables expr type
2687  *      @type: expr type
2688  *
2689  *      Unregisters the expr typefor use with nf_tables.
2690  */
2691 void nft_unregister_expr(struct nft_expr_type *type)
2692 {
2693         nfnl_lock(NFNL_SUBSYS_NFTABLES);
2694         list_del_rcu(&type->list);
2695         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2696 }
2697 EXPORT_SYMBOL_GPL(nft_unregister_expr);
2698
2699 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
2700                                                        struct nlattr *nla)
2701 {
2702         const struct nft_expr_type *type, *candidate = NULL;
2703
2704         list_for_each_entry(type, &nf_tables_expressions, list) {
2705                 if (!nla_strcmp(nla, type->name)) {
2706                         if (!type->family && !candidate)
2707                                 candidate = type;
2708                         else if (type->family == family)
2709                                 candidate = type;
2710                 }
2711         }
2712         return candidate;
2713 }
2714
2715 #ifdef CONFIG_MODULES
2716 static int nft_expr_type_request_module(struct net *net, u8 family,
2717                                         struct nlattr *nla)
2718 {
2719         if (nft_request_module(net, "nft-expr-%u-%.*s", family,
2720                                nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
2721                 return -EAGAIN;
2722
2723         return 0;
2724 }
2725 #endif
2726
2727 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
2728                                                      u8 family,
2729                                                      struct nlattr *nla)
2730 {
2731         const struct nft_expr_type *type;
2732
2733         if (nla == NULL)
2734                 return ERR_PTR(-EINVAL);
2735
2736         type = __nft_expr_type_get(family, nla);
2737         if (type != NULL && try_module_get(type->owner))
2738                 return type;
2739
2740         lockdep_nfnl_nft_mutex_not_held();
2741 #ifdef CONFIG_MODULES
2742         if (type == NULL) {
2743                 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
2744                         return ERR_PTR(-EAGAIN);
2745
2746                 if (nft_request_module(net, "nft-expr-%.*s",
2747                                        nla_len(nla),
2748                                        (char *)nla_data(nla)) == -EAGAIN)
2749                         return ERR_PTR(-EAGAIN);
2750         }
2751 #endif
2752         return ERR_PTR(-ENOENT);
2753 }
2754
2755 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
2756         [NFTA_EXPR_NAME]        = { .type = NLA_STRING,
2757                                     .len = NFT_MODULE_AUTOLOAD_LIMIT },
2758         [NFTA_EXPR_DATA]        = { .type = NLA_NESTED },
2759 };
2760
2761 static int nf_tables_fill_expr_info(struct sk_buff *skb,
2762                                     const struct nft_expr *expr)
2763 {
2764         if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
2765                 goto nla_put_failure;
2766
2767         if (expr->ops->dump) {
2768                 struct nlattr *data = nla_nest_start_noflag(skb,
2769                                                             NFTA_EXPR_DATA);
2770                 if (data == NULL)
2771                         goto nla_put_failure;
2772                 if (expr->ops->dump(skb, expr) < 0)
2773                         goto nla_put_failure;
2774                 nla_nest_end(skb, data);
2775         }
2776
2777         return skb->len;
2778
2779 nla_put_failure:
2780         return -1;
2781 };
2782
2783 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
2784                   const struct nft_expr *expr)
2785 {
2786         struct nlattr *nest;
2787
2788         nest = nla_nest_start_noflag(skb, attr);
2789         if (!nest)
2790                 goto nla_put_failure;
2791         if (nf_tables_fill_expr_info(skb, expr) < 0)
2792                 goto nla_put_failure;
2793         nla_nest_end(skb, nest);
2794         return 0;
2795
2796 nla_put_failure:
2797         return -1;
2798 }
2799
2800 struct nft_expr_info {
2801         const struct nft_expr_ops       *ops;
2802         const struct nlattr             *attr;
2803         struct nlattr                   *tb[NFT_EXPR_MAXATTR + 1];
2804 };
2805
2806 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
2807                                 const struct nlattr *nla,
2808                                 struct nft_expr_info *info)
2809 {
2810         const struct nft_expr_type *type;
2811         const struct nft_expr_ops *ops;
2812         struct nlattr *tb[NFTA_EXPR_MAX + 1];
2813         int err;
2814
2815         err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
2816                                           nft_expr_policy, NULL);
2817         if (err < 0)
2818                 return err;
2819
2820         type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
2821         if (IS_ERR(type))
2822                 return PTR_ERR(type);
2823
2824         if (tb[NFTA_EXPR_DATA]) {
2825                 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
2826                                                   tb[NFTA_EXPR_DATA],
2827                                                   type->policy, NULL);
2828                 if (err < 0)
2829                         goto err1;
2830         } else
2831                 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
2832
2833         if (type->select_ops != NULL) {
2834                 ops = type->select_ops(ctx,
2835                                        (const struct nlattr * const *)info->tb);
2836                 if (IS_ERR(ops)) {
2837                         err = PTR_ERR(ops);
2838 #ifdef CONFIG_MODULES
2839                         if (err == -EAGAIN)
2840                                 if (nft_expr_type_request_module(ctx->net,
2841                                                                  ctx->family,
2842                                                                  tb[NFTA_EXPR_NAME]) != -EAGAIN)
2843                                         err = -ENOENT;
2844 #endif
2845                         goto err1;
2846                 }
2847         } else
2848                 ops = type->ops;
2849
2850         info->attr = nla;
2851         info->ops = ops;
2852
2853         return 0;
2854
2855 err1:
2856         module_put(type->owner);
2857         return err;
2858 }
2859
2860 static int nf_tables_newexpr(const struct nft_ctx *ctx,
2861                              const struct nft_expr_info *expr_info,
2862                              struct nft_expr *expr)
2863 {
2864         const struct nft_expr_ops *ops = expr_info->ops;
2865         int err;
2866
2867         expr->ops = ops;
2868         if (ops->init) {
2869                 err = ops->init(ctx, expr, (const struct nlattr **)expr_info->tb);
2870                 if (err < 0)
2871                         goto err1;
2872         }
2873
2874         return 0;
2875 err1:
2876         expr->ops = NULL;
2877         return err;
2878 }
2879
2880 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
2881                                    struct nft_expr *expr)
2882 {
2883         const struct nft_expr_type *type = expr->ops->type;
2884
2885         if (expr->ops->destroy)
2886                 expr->ops->destroy(ctx, expr);
2887         module_put(type->owner);
2888 }
2889
2890 static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
2891                                       const struct nlattr *nla)
2892 {
2893         struct nft_expr_info expr_info;
2894         struct nft_expr *expr;
2895         struct module *owner;
2896         int err;
2897
2898         err = nf_tables_expr_parse(ctx, nla, &expr_info);
2899         if (err < 0)
2900                 goto err_expr_parse;
2901
2902         err = -EOPNOTSUPP;
2903         if (!(expr_info.ops->type->flags & NFT_EXPR_STATEFUL))
2904                 goto err_expr_stateful;
2905
2906         err = -ENOMEM;
2907         expr = kzalloc(expr_info.ops->size, GFP_KERNEL_ACCOUNT);
2908         if (expr == NULL)
2909                 goto err_expr_stateful;
2910
2911         err = nf_tables_newexpr(ctx, &expr_info, expr);
2912         if (err < 0)
2913                 goto err_expr_new;
2914
2915         return expr;
2916 err_expr_new:
2917         kfree(expr);
2918 err_expr_stateful:
2919         owner = expr_info.ops->type->owner;
2920         if (expr_info.ops->type->release_ops)
2921                 expr_info.ops->type->release_ops(expr_info.ops);
2922
2923         module_put(owner);
2924 err_expr_parse:
2925         return ERR_PTR(err);
2926 }
2927
2928 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
2929 {
2930         int err;
2931
2932         if (src->ops->clone) {
2933                 dst->ops = src->ops;
2934                 err = src->ops->clone(dst, src);
2935                 if (err < 0)
2936                         return err;
2937         } else {
2938                 memcpy(dst, src, src->ops->size);
2939         }
2940
2941         __module_get(src->ops->type->owner);
2942
2943         return 0;
2944 }
2945
2946 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
2947 {
2948         nf_tables_expr_destroy(ctx, expr);
2949         kfree(expr);
2950 }
2951
2952 /*
2953  * Rules
2954  */
2955
2956 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
2957                                           u64 handle)
2958 {
2959         struct nft_rule *rule;
2960
2961         // FIXME: this sucks
2962         list_for_each_entry_rcu(rule, &chain->rules, list) {
2963                 if (handle == rule->handle)
2964                         return rule;
2965         }
2966
2967         return ERR_PTR(-ENOENT);
2968 }
2969
2970 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
2971                                         const struct nlattr *nla)
2972 {
2973         if (nla == NULL)
2974                 return ERR_PTR(-EINVAL);
2975
2976         return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
2977 }
2978
2979 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
2980         [NFTA_RULE_TABLE]       = { .type = NLA_STRING,
2981                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
2982         [NFTA_RULE_CHAIN]       = { .type = NLA_STRING,
2983                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
2984         [NFTA_RULE_HANDLE]      = { .type = NLA_U64 },
2985         [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
2986         [NFTA_RULE_COMPAT]      = { .type = NLA_NESTED },
2987         [NFTA_RULE_POSITION]    = { .type = NLA_U64 },
2988         [NFTA_RULE_USERDATA]    = { .type = NLA_BINARY,
2989                                     .len = NFT_USERDATA_MAXLEN },
2990         [NFTA_RULE_ID]          = { .type = NLA_U32 },
2991         [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
2992         [NFTA_RULE_CHAIN_ID]    = { .type = NLA_U32 },
2993 };
2994
2995 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
2996                                     u32 portid, u32 seq, int event,
2997                                     u32 flags, int family,
2998                                     const struct nft_table *table,
2999                                     const struct nft_chain *chain,
3000                                     const struct nft_rule *rule, u64 handle)
3001 {
3002         struct nlmsghdr *nlh;
3003         const struct nft_expr *expr, *next;
3004         struct nlattr *list;
3005         u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3006
3007         nlh = nfnl_msg_put(skb, portid, seq, type, flags, family, NFNETLINK_V0,
3008                            nft_base_seq(net));
3009         if (!nlh)
3010                 goto nla_put_failure;
3011
3012         if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
3013                 goto nla_put_failure;
3014         if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
3015                 goto nla_put_failure;
3016         if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
3017                          NFTA_RULE_PAD))
3018                 goto nla_put_failure;
3019
3020         if (event != NFT_MSG_DELRULE && handle) {
3021                 if (nla_put_be64(skb, NFTA_RULE_POSITION, cpu_to_be64(handle),
3022                                  NFTA_RULE_PAD))
3023                         goto nla_put_failure;
3024         }
3025
3026         if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
3027                 nft_flow_rule_stats(chain, rule);
3028
3029         list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
3030         if (list == NULL)
3031                 goto nla_put_failure;
3032         nft_rule_for_each_expr(expr, next, rule) {
3033                 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
3034                         goto nla_put_failure;
3035         }
3036         nla_nest_end(skb, list);
3037
3038         if (rule->udata) {
3039                 struct nft_userdata *udata = nft_userdata(rule);
3040                 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
3041                             udata->data) < 0)
3042                         goto nla_put_failure;
3043         }
3044
3045         nlmsg_end(skb, nlh);
3046         return 0;
3047
3048 nla_put_failure:
3049         nlmsg_trim(skb, nlh);
3050         return -1;
3051 }
3052
3053 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
3054                                   const struct nft_rule *rule, int event)
3055 {
3056         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3057         const struct nft_rule *prule;
3058         struct sk_buff *skb;
3059         u64 handle = 0;
3060         u16 flags = 0;
3061         int err;
3062
3063         if (!ctx->report &&
3064             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3065                 return;
3066
3067         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3068         if (skb == NULL)
3069                 goto err;
3070
3071         if (event == NFT_MSG_NEWRULE &&
3072             !list_is_first(&rule->list, &ctx->chain->rules) &&
3073             !list_is_last(&rule->list, &ctx->chain->rules)) {
3074                 prule = list_prev_entry(rule, list);
3075                 handle = prule->handle;
3076         }
3077         if (ctx->flags & (NLM_F_APPEND | NLM_F_REPLACE))
3078                 flags |= NLM_F_APPEND;
3079         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
3080                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
3081
3082         err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
3083                                        event, flags, ctx->family, ctx->table,
3084                                        ctx->chain, rule, handle);
3085         if (err < 0) {
3086                 kfree_skb(skb);
3087                 goto err;
3088         }
3089
3090         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
3091         return;
3092 err:
3093         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
3094 }
3095
3096 struct nft_rule_dump_ctx {
3097         char *table;
3098         char *chain;
3099 };
3100
3101 static int __nf_tables_dump_rules(struct sk_buff *skb,
3102                                   unsigned int *idx,
3103                                   struct netlink_callback *cb,
3104                                   const struct nft_table *table,
3105                                   const struct nft_chain *chain)
3106 {
3107         struct net *net = sock_net(skb->sk);
3108         const struct nft_rule *rule, *prule;
3109         unsigned int s_idx = cb->args[0];
3110         u64 handle;
3111
3112         prule = NULL;
3113         list_for_each_entry_rcu(rule, &chain->rules, list) {
3114                 if (!nft_is_active(net, rule))
3115                         goto cont_skip;
3116                 if (*idx < s_idx)
3117                         goto cont;
3118                 if (*idx > s_idx) {
3119                         memset(&cb->args[1], 0,
3120                                         sizeof(cb->args) - sizeof(cb->args[0]));
3121                 }
3122                 if (prule)
3123                         handle = prule->handle;
3124                 else
3125                         handle = 0;
3126
3127                 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
3128                                         cb->nlh->nlmsg_seq,
3129                                         NFT_MSG_NEWRULE,
3130                                         NLM_F_MULTI | NLM_F_APPEND,
3131                                         table->family,
3132                                         table, chain, rule, handle) < 0)
3133                         return 1;
3134
3135                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3136 cont:
3137                 prule = rule;
3138 cont_skip:
3139                 (*idx)++;
3140         }
3141         return 0;
3142 }
3143
3144 static int nf_tables_dump_rules(struct sk_buff *skb,
3145                                 struct netlink_callback *cb)
3146 {
3147         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3148         const struct nft_rule_dump_ctx *ctx = cb->data;
3149         struct nft_table *table;
3150         const struct nft_chain *chain;
3151         unsigned int idx = 0;
3152         struct net *net = sock_net(skb->sk);
3153         int family = nfmsg->nfgen_family;
3154         struct nftables_pernet *nft_net;
3155
3156         rcu_read_lock();
3157         nft_net = nft_pernet(net);
3158         cb->seq = READ_ONCE(nft_net->base_seq);
3159
3160         list_for_each_entry_rcu(table, &nft_net->tables, list) {
3161                 if (family != NFPROTO_UNSPEC && family != table->family)
3162                         continue;
3163
3164                 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
3165                         continue;
3166
3167                 if (ctx && ctx->table && ctx->chain) {
3168                         struct rhlist_head *list, *tmp;
3169
3170                         list = rhltable_lookup(&table->chains_ht, ctx->chain,
3171                                                nft_chain_ht_params);
3172                         if (!list)
3173                                 goto done;
3174
3175                         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
3176                                 if (!nft_is_active(net, chain))
3177                                         continue;
3178                                 __nf_tables_dump_rules(skb, &idx,
3179                                                        cb, table, chain);
3180                                 break;
3181                         }
3182                         goto done;
3183                 }
3184
3185                 list_for_each_entry_rcu(chain, &table->chains, list) {
3186                         if (__nf_tables_dump_rules(skb, &idx, cb, table, chain))
3187                                 goto done;
3188                 }
3189
3190                 if (ctx && ctx->table)
3191                         break;
3192         }
3193 done:
3194         rcu_read_unlock();
3195
3196         cb->args[0] = idx;
3197         return skb->len;
3198 }
3199
3200 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
3201 {
3202         const struct nlattr * const *nla = cb->data;
3203         struct nft_rule_dump_ctx *ctx = NULL;
3204
3205         if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
3206                 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
3207                 if (!ctx)
3208                         return -ENOMEM;
3209
3210                 if (nla[NFTA_RULE_TABLE]) {
3211                         ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
3212                                                         GFP_ATOMIC);
3213                         if (!ctx->table) {
3214                                 kfree(ctx);
3215                                 return -ENOMEM;
3216                         }
3217                 }
3218                 if (nla[NFTA_RULE_CHAIN]) {
3219                         ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
3220                                                 GFP_ATOMIC);
3221                         if (!ctx->chain) {
3222                                 kfree(ctx->table);
3223                                 kfree(ctx);
3224                                 return -ENOMEM;
3225                         }
3226                 }
3227         }
3228
3229         cb->data = ctx;
3230         return 0;
3231 }
3232
3233 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
3234 {
3235         struct nft_rule_dump_ctx *ctx = cb->data;
3236
3237         if (ctx) {
3238                 kfree(ctx->table);
3239                 kfree(ctx->chain);
3240                 kfree(ctx);
3241         }
3242         return 0;
3243 }
3244
3245 /* called with rcu_read_lock held */
3246 static int nf_tables_getrule(struct sk_buff *skb, const struct nfnl_info *info,
3247                              const struct nlattr * const nla[])
3248 {
3249         struct netlink_ext_ack *extack = info->extack;
3250         u8 genmask = nft_genmask_cur(info->net);
3251         u8 family = info->nfmsg->nfgen_family;
3252         const struct nft_chain *chain;
3253         const struct nft_rule *rule;
3254         struct net *net = info->net;
3255         struct nft_table *table;
3256         struct sk_buff *skb2;
3257         int err;
3258
3259         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3260                 struct netlink_dump_control c = {
3261                         .start= nf_tables_dump_rules_start,
3262                         .dump = nf_tables_dump_rules,
3263                         .done = nf_tables_dump_rules_done,
3264                         .module = THIS_MODULE,
3265                         .data = (void *)nla,
3266                 };
3267
3268                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
3269         }
3270
3271         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 0);
3272         if (IS_ERR(table)) {
3273                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3274                 return PTR_ERR(table);
3275         }
3276
3277         chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
3278         if (IS_ERR(chain)) {
3279                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3280                 return PTR_ERR(chain);
3281         }
3282
3283         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3284         if (IS_ERR(rule)) {
3285                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3286                 return PTR_ERR(rule);
3287         }
3288
3289         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3290         if (!skb2)
3291                 return -ENOMEM;
3292
3293         err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
3294                                        info->nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
3295                                        family, table, chain, rule, 0);
3296         if (err < 0)
3297                 goto err_fill_rule_info;
3298
3299         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
3300
3301 err_fill_rule_info:
3302         kfree_skb(skb2);
3303         return err;
3304 }
3305
3306 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
3307                                    struct nft_rule *rule)
3308 {
3309         struct nft_expr *expr, *next;
3310
3311         /*
3312          * Careful: some expressions might not be initialized in case this
3313          * is called on error from nf_tables_newrule().
3314          */
3315         expr = nft_expr_first(rule);
3316         while (nft_expr_more(rule, expr)) {
3317                 next = nft_expr_next(expr);
3318                 nf_tables_expr_destroy(ctx, expr);
3319                 expr = next;
3320         }
3321         kfree(rule);
3322 }
3323
3324 void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule)
3325 {
3326         nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
3327         nf_tables_rule_destroy(ctx, rule);
3328 }
3329
3330 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
3331 {
3332         struct nft_expr *expr, *last;
3333         const struct nft_data *data;
3334         struct nft_rule *rule;
3335         int err;
3336
3337         if (ctx->level == NFT_JUMP_STACK_SIZE)
3338                 return -EMLINK;
3339
3340         list_for_each_entry(rule, &chain->rules, list) {
3341                 if (!nft_is_active_next(ctx->net, rule))
3342                         continue;
3343
3344                 nft_rule_for_each_expr(expr, last, rule) {
3345                         if (!expr->ops->validate)
3346                                 continue;
3347
3348                         err = expr->ops->validate(ctx, expr, &data);
3349                         if (err < 0)
3350                                 return err;
3351                 }
3352
3353                 cond_resched();
3354         }
3355
3356         return 0;
3357 }
3358 EXPORT_SYMBOL_GPL(nft_chain_validate);
3359
3360 static int nft_table_validate(struct net *net, const struct nft_table *table)
3361 {
3362         struct nft_chain *chain;
3363         struct nft_ctx ctx = {
3364                 .net    = net,
3365                 .family = table->family,
3366         };
3367         int err;
3368
3369         list_for_each_entry(chain, &table->chains, list) {
3370                 if (!nft_is_base_chain(chain))
3371                         continue;
3372
3373                 ctx.chain = chain;
3374                 err = nft_chain_validate(&ctx, chain);
3375                 if (err < 0)
3376                         return err;
3377         }
3378
3379         return 0;
3380 }
3381
3382 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3383                                              const struct nft_chain *chain,
3384                                              const struct nlattr *nla);
3385
3386 #define NFT_RULE_MAXEXPRS       128
3387
3388 static int nf_tables_newrule(struct sk_buff *skb, const struct nfnl_info *info,
3389                              const struct nlattr * const nla[])
3390 {
3391         struct nftables_pernet *nft_net = nft_pernet(info->net);
3392         struct netlink_ext_ack *extack = info->extack;
3393         unsigned int size, i, n, ulen = 0, usize = 0;
3394         u8 genmask = nft_genmask_next(info->net);
3395         struct nft_rule *rule, *old_rule = NULL;
3396         struct nft_expr_info *expr_info = NULL;
3397         u8 family = info->nfmsg->nfgen_family;
3398         struct nft_flow_rule *flow = NULL;
3399         struct net *net = info->net;
3400         struct nft_userdata *udata;
3401         struct nft_table *table;
3402         struct nft_chain *chain;
3403         struct nft_trans *trans;
3404         u64 handle, pos_handle;
3405         struct nft_expr *expr;
3406         struct nft_ctx ctx;
3407         struct nlattr *tmp;
3408         int err, rem;
3409
3410         lockdep_assert_held(&nft_net->commit_mutex);
3411
3412         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3413                                  NETLINK_CB(skb).portid);
3414         if (IS_ERR(table)) {
3415                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3416                 return PTR_ERR(table);
3417         }
3418
3419         if (nla[NFTA_RULE_CHAIN]) {
3420                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3421                                          genmask);
3422                 if (IS_ERR(chain)) {
3423                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3424                         return PTR_ERR(chain);
3425                 }
3426                 if (nft_chain_is_bound(chain))
3427                         return -EOPNOTSUPP;
3428
3429         } else if (nla[NFTA_RULE_CHAIN_ID]) {
3430                 chain = nft_chain_lookup_byid(net, table, nla[NFTA_RULE_CHAIN_ID]);
3431                 if (IS_ERR(chain)) {
3432                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]);
3433                         return PTR_ERR(chain);
3434                 }
3435         } else {
3436                 return -EINVAL;
3437         }
3438
3439         if (nla[NFTA_RULE_HANDLE]) {
3440                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
3441                 rule = __nft_rule_lookup(chain, handle);
3442                 if (IS_ERR(rule)) {
3443                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3444                         return PTR_ERR(rule);
3445                 }
3446
3447                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
3448                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3449                         return -EEXIST;
3450                 }
3451                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
3452                         old_rule = rule;
3453                 else
3454                         return -EOPNOTSUPP;
3455         } else {
3456                 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE) ||
3457                     info->nlh->nlmsg_flags & NLM_F_REPLACE)
3458                         return -EINVAL;
3459                 handle = nf_tables_alloc_handle(table);
3460
3461                 if (chain->use == UINT_MAX)
3462                         return -EOVERFLOW;
3463
3464                 if (nla[NFTA_RULE_POSITION]) {
3465                         pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
3466                         old_rule = __nft_rule_lookup(chain, pos_handle);
3467                         if (IS_ERR(old_rule)) {
3468                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
3469                                 return PTR_ERR(old_rule);
3470                         }
3471                 } else if (nla[NFTA_RULE_POSITION_ID]) {
3472                         old_rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_POSITION_ID]);
3473                         if (IS_ERR(old_rule)) {
3474                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
3475                                 return PTR_ERR(old_rule);
3476                         }
3477                 }
3478         }
3479
3480         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3481
3482         n = 0;
3483         size = 0;
3484         if (nla[NFTA_RULE_EXPRESSIONS]) {
3485                 expr_info = kvmalloc_array(NFT_RULE_MAXEXPRS,
3486                                            sizeof(struct nft_expr_info),
3487                                            GFP_KERNEL);
3488                 if (!expr_info)
3489                         return -ENOMEM;
3490
3491                 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
3492                         err = -EINVAL;
3493                         if (nla_type(tmp) != NFTA_LIST_ELEM)
3494                                 goto err_release_expr;
3495                         if (n == NFT_RULE_MAXEXPRS)
3496                                 goto err_release_expr;
3497                         err = nf_tables_expr_parse(&ctx, tmp, &expr_info[n]);
3498                         if (err < 0) {
3499                                 NL_SET_BAD_ATTR(extack, tmp);
3500                                 goto err_release_expr;
3501                         }
3502                         size += expr_info[n].ops->size;
3503                         n++;
3504                 }
3505         }
3506         /* Check for overflow of dlen field */
3507         err = -EFBIG;
3508         if (size >= 1 << 12)
3509                 goto err_release_expr;
3510
3511         if (nla[NFTA_RULE_USERDATA]) {
3512                 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
3513                 if (ulen > 0)
3514                         usize = sizeof(struct nft_userdata) + ulen;
3515         }
3516
3517         err = -ENOMEM;
3518         rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL_ACCOUNT);
3519         if (rule == NULL)
3520                 goto err_release_expr;
3521
3522         nft_activate_next(net, rule);
3523
3524         rule->handle = handle;
3525         rule->dlen   = size;
3526         rule->udata  = ulen ? 1 : 0;
3527
3528         if (ulen) {
3529                 udata = nft_userdata(rule);
3530                 udata->len = ulen - 1;
3531                 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
3532         }
3533
3534         expr = nft_expr_first(rule);
3535         for (i = 0; i < n; i++) {
3536                 err = nf_tables_newexpr(&ctx, &expr_info[i], expr);
3537                 if (err < 0) {
3538                         NL_SET_BAD_ATTR(extack, expr_info[i].attr);
3539                         goto err_release_rule;
3540                 }
3541
3542                 if (expr_info[i].ops->validate)
3543                         nft_validate_state_update(net, NFT_VALIDATE_NEED);
3544
3545                 expr_info[i].ops = NULL;
3546                 expr = nft_expr_next(expr);
3547         }
3548
3549         if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
3550                 flow = nft_flow_rule_create(net, rule);
3551                 if (IS_ERR(flow)) {
3552                         err = PTR_ERR(flow);
3553                         goto err_release_rule;
3554                 }
3555         }
3556
3557         if (info->nlh->nlmsg_flags & NLM_F_REPLACE) {
3558                 err = nft_delrule(&ctx, old_rule);
3559                 if (err < 0)
3560                         goto err_destroy_flow_rule;
3561
3562                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3563                 if (trans == NULL) {
3564                         err = -ENOMEM;
3565                         goto err_destroy_flow_rule;
3566                 }
3567                 list_add_tail_rcu(&rule->list, &old_rule->list);
3568         } else {
3569                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3570                 if (!trans) {
3571                         err = -ENOMEM;
3572                         goto err_destroy_flow_rule;
3573                 }
3574
3575                 if (info->nlh->nlmsg_flags & NLM_F_APPEND) {
3576                         if (old_rule)
3577                                 list_add_rcu(&rule->list, &old_rule->list);
3578                         else
3579                                 list_add_tail_rcu(&rule->list, &chain->rules);
3580                  } else {
3581                         if (old_rule)
3582                                 list_add_tail_rcu(&rule->list, &old_rule->list);
3583                         else
3584                                 list_add_rcu(&rule->list, &chain->rules);
3585                 }
3586         }
3587         kvfree(expr_info);
3588         chain->use++;
3589
3590         if (flow)
3591                 nft_trans_flow_rule(trans) = flow;
3592
3593         if (nft_net->validate_state == NFT_VALIDATE_DO)
3594                 return nft_table_validate(net, table);
3595
3596         return 0;
3597
3598 err_destroy_flow_rule:
3599         if (flow)
3600                 nft_flow_rule_destroy(flow);
3601 err_release_rule:
3602         nf_tables_rule_release(&ctx, rule);
3603 err_release_expr:
3604         for (i = 0; i < n; i++) {
3605                 if (expr_info[i].ops) {
3606                         module_put(expr_info[i].ops->type->owner);
3607                         if (expr_info[i].ops->type->release_ops)
3608                                 expr_info[i].ops->type->release_ops(expr_info[i].ops);
3609                 }
3610         }
3611         kvfree(expr_info);
3612
3613         return err;
3614 }
3615
3616 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3617                                              const struct nft_chain *chain,
3618                                              const struct nlattr *nla)
3619 {
3620         struct nftables_pernet *nft_net = nft_pernet(net);
3621         u32 id = ntohl(nla_get_be32(nla));
3622         struct nft_trans *trans;
3623
3624         list_for_each_entry(trans, &nft_net->commit_list, list) {
3625                 struct nft_rule *rule = nft_trans_rule(trans);
3626
3627                 if (trans->msg_type == NFT_MSG_NEWRULE &&
3628                     trans->ctx.chain == chain &&
3629                     id == nft_trans_rule_id(trans))
3630                         return rule;
3631         }
3632         return ERR_PTR(-ENOENT);
3633 }
3634
3635 static int nf_tables_delrule(struct sk_buff *skb, const struct nfnl_info *info,
3636                              const struct nlattr * const nla[])
3637 {
3638         struct netlink_ext_ack *extack = info->extack;
3639         u8 genmask = nft_genmask_next(info->net);
3640         u8 family = info->nfmsg->nfgen_family;
3641         struct nft_chain *chain = NULL;
3642         struct net *net = info->net;
3643         struct nft_table *table;
3644         struct nft_rule *rule;
3645         struct nft_ctx ctx;
3646         int err = 0;
3647
3648         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3649                                  NETLINK_CB(skb).portid);
3650         if (IS_ERR(table)) {
3651                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3652                 return PTR_ERR(table);
3653         }
3654
3655         if (nla[NFTA_RULE_CHAIN]) {
3656                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3657                                          genmask);
3658                 if (IS_ERR(chain)) {
3659                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3660                         return PTR_ERR(chain);
3661                 }
3662                 if (nft_chain_is_bound(chain))
3663                         return -EOPNOTSUPP;
3664         }
3665
3666         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3667
3668         if (chain) {
3669                 if (nla[NFTA_RULE_HANDLE]) {
3670                         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3671                         if (IS_ERR(rule)) {
3672                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3673                                 return PTR_ERR(rule);
3674                         }
3675
3676                         err = nft_delrule(&ctx, rule);
3677                 } else if (nla[NFTA_RULE_ID]) {
3678                         rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_ID]);
3679                         if (IS_ERR(rule)) {
3680                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
3681                                 return PTR_ERR(rule);
3682                         }
3683
3684                         err = nft_delrule(&ctx, rule);
3685                 } else {
3686                         err = nft_delrule_by_chain(&ctx);
3687                 }
3688         } else {
3689                 list_for_each_entry(chain, &table->chains, list) {
3690                         if (!nft_is_active_next(net, chain))
3691                                 continue;
3692
3693                         ctx.chain = chain;
3694                         err = nft_delrule_by_chain(&ctx);
3695                         if (err < 0)
3696                                 break;
3697                 }
3698         }
3699
3700         return err;
3701 }
3702
3703 /*
3704  * Sets
3705  */
3706 static const struct nft_set_type *nft_set_types[] = {
3707         &nft_set_hash_fast_type,
3708         &nft_set_hash_type,
3709         &nft_set_rhash_type,
3710         &nft_set_bitmap_type,
3711         &nft_set_rbtree_type,
3712 #if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
3713         &nft_set_pipapo_avx2_type,
3714 #endif
3715         &nft_set_pipapo_type,
3716 };
3717
3718 #define NFT_SET_FEATURES        (NFT_SET_INTERVAL | NFT_SET_MAP | \
3719                                  NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
3720                                  NFT_SET_EVAL)
3721
3722 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
3723 {
3724         return (flags & type->features) == (flags & NFT_SET_FEATURES);
3725 }
3726
3727 /*
3728  * Select a set implementation based on the data characteristics and the
3729  * given policy. The total memory use might not be known if no size is
3730  * given, in that case the amount of memory per element is used.
3731  */
3732 static const struct nft_set_ops *
3733 nft_select_set_ops(const struct nft_ctx *ctx,
3734                    const struct nlattr * const nla[],
3735                    const struct nft_set_desc *desc)
3736 {
3737         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3738         const struct nft_set_ops *ops, *bops;
3739         struct nft_set_estimate est, best;
3740         const struct nft_set_type *type;
3741         u32 flags = 0;
3742         int i;
3743
3744         lockdep_assert_held(&nft_net->commit_mutex);
3745         lockdep_nfnl_nft_mutex_not_held();
3746
3747         if (nla[NFTA_SET_FLAGS] != NULL)
3748                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
3749
3750         bops        = NULL;
3751         best.size   = ~0;
3752         best.lookup = ~0;
3753         best.space  = ~0;
3754
3755         for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
3756                 type = nft_set_types[i];
3757                 ops = &type->ops;
3758
3759                 if (!nft_set_ops_candidate(type, flags))
3760                         continue;
3761                 if (!ops->estimate(desc, flags, &est))
3762                         continue;
3763
3764                 switch (desc->policy) {
3765                 case NFT_SET_POL_PERFORMANCE:
3766                         if (est.lookup < best.lookup)
3767                                 break;
3768                         if (est.lookup == best.lookup &&
3769                             est.space < best.space)
3770                                 break;
3771                         continue;
3772                 case NFT_SET_POL_MEMORY:
3773                         if (!desc->size) {
3774                                 if (est.space < best.space)
3775                                         break;
3776                                 if (est.space == best.space &&
3777                                     est.lookup < best.lookup)
3778                                         break;
3779                         } else if (est.size < best.size || !bops) {
3780                                 break;
3781                         }
3782                         continue;
3783                 default:
3784                         break;
3785                 }
3786
3787                 bops = ops;
3788                 best = est;
3789         }
3790
3791         if (bops != NULL)
3792                 return bops;
3793
3794         return ERR_PTR(-EOPNOTSUPP);
3795 }
3796
3797 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
3798         [NFTA_SET_TABLE]                = { .type = NLA_STRING,
3799                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
3800         [NFTA_SET_NAME]                 = { .type = NLA_STRING,
3801                                             .len = NFT_SET_MAXNAMELEN - 1 },
3802         [NFTA_SET_FLAGS]                = { .type = NLA_U32 },
3803         [NFTA_SET_KEY_TYPE]             = { .type = NLA_U32 },
3804         [NFTA_SET_KEY_LEN]              = { .type = NLA_U32 },
3805         [NFTA_SET_DATA_TYPE]            = { .type = NLA_U32 },
3806         [NFTA_SET_DATA_LEN]             = { .type = NLA_U32 },
3807         [NFTA_SET_POLICY]               = { .type = NLA_U32 },
3808         [NFTA_SET_DESC]                 = { .type = NLA_NESTED },
3809         [NFTA_SET_ID]                   = { .type = NLA_U32 },
3810         [NFTA_SET_TIMEOUT]              = { .type = NLA_U64 },
3811         [NFTA_SET_GC_INTERVAL]          = { .type = NLA_U32 },
3812         [NFTA_SET_USERDATA]             = { .type = NLA_BINARY,
3813                                             .len  = NFT_USERDATA_MAXLEN },
3814         [NFTA_SET_OBJ_TYPE]             = { .type = NLA_U32 },
3815         [NFTA_SET_HANDLE]               = { .type = NLA_U64 },
3816         [NFTA_SET_EXPR]                 = { .type = NLA_NESTED },
3817         [NFTA_SET_EXPRESSIONS]          = { .type = NLA_NESTED },
3818 };
3819
3820 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
3821         [NFTA_SET_DESC_SIZE]            = { .type = NLA_U32 },
3822         [NFTA_SET_DESC_CONCAT]          = { .type = NLA_NESTED },
3823 };
3824
3825 static struct nft_set *nft_set_lookup(const struct nft_table *table,
3826                                       const struct nlattr *nla, u8 genmask)
3827 {
3828         struct nft_set *set;
3829
3830         if (nla == NULL)
3831                 return ERR_PTR(-EINVAL);
3832
3833         list_for_each_entry_rcu(set, &table->sets, list) {
3834                 if (!nla_strcmp(nla, set->name) &&
3835                     nft_active_genmask(set, genmask))
3836                         return set;
3837         }
3838         return ERR_PTR(-ENOENT);
3839 }
3840
3841 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
3842                                                const struct nlattr *nla,
3843                                                u8 genmask)
3844 {
3845         struct nft_set *set;
3846
3847         list_for_each_entry(set, &table->sets, list) {
3848                 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
3849                     nft_active_genmask(set, genmask))
3850                         return set;
3851         }
3852         return ERR_PTR(-ENOENT);
3853 }
3854
3855 static struct nft_set *nft_set_lookup_byid(const struct net *net,
3856                                            const struct nft_table *table,
3857                                            const struct nlattr *nla, u8 genmask)
3858 {
3859         struct nftables_pernet *nft_net = nft_pernet(net);
3860         u32 id = ntohl(nla_get_be32(nla));
3861         struct nft_trans *trans;
3862
3863         list_for_each_entry(trans, &nft_net->commit_list, list) {
3864                 if (trans->msg_type == NFT_MSG_NEWSET) {
3865                         struct nft_set *set = nft_trans_set(trans);
3866
3867                         if (id == nft_trans_set_id(trans) &&
3868                             set->table == table &&
3869                             nft_active_genmask(set, genmask))
3870                                 return set;
3871                 }
3872         }
3873         return ERR_PTR(-ENOENT);
3874 }
3875
3876 struct nft_set *nft_set_lookup_global(const struct net *net,
3877                                       const struct nft_table *table,
3878                                       const struct nlattr *nla_set_name,
3879                                       const struct nlattr *nla_set_id,
3880                                       u8 genmask)
3881 {
3882         struct nft_set *set;
3883
3884         set = nft_set_lookup(table, nla_set_name, genmask);
3885         if (IS_ERR(set)) {
3886                 if (!nla_set_id)
3887                         return set;
3888
3889                 set = nft_set_lookup_byid(net, table, nla_set_id, genmask);
3890         }
3891         return set;
3892 }
3893 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
3894
3895 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
3896                                     const char *name)
3897 {
3898         const struct nft_set *i;
3899         const char *p;
3900         unsigned long *inuse;
3901         unsigned int n = 0, min = 0;
3902
3903         p = strchr(name, '%');
3904         if (p != NULL) {
3905                 if (p[1] != 'd' || strchr(p + 2, '%'))
3906                         return -EINVAL;
3907
3908                 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
3909                 if (inuse == NULL)
3910                         return -ENOMEM;
3911 cont:
3912                 list_for_each_entry(i, &ctx->table->sets, list) {
3913                         int tmp;
3914
3915                         if (!nft_is_active_next(ctx->net, i))
3916                                 continue;
3917                         if (!sscanf(i->name, name, &tmp))
3918                                 continue;
3919                         if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
3920                                 continue;
3921
3922                         set_bit(tmp - min, inuse);
3923                 }
3924
3925                 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
3926                 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
3927                         min += BITS_PER_BYTE * PAGE_SIZE;
3928                         memset(inuse, 0, PAGE_SIZE);
3929                         goto cont;
3930                 }
3931                 free_page((unsigned long)inuse);
3932         }
3933
3934         set->name = kasprintf(GFP_KERNEL_ACCOUNT, name, min + n);
3935         if (!set->name)
3936                 return -ENOMEM;
3937
3938         list_for_each_entry(i, &ctx->table->sets, list) {
3939                 if (!nft_is_active_next(ctx->net, i))
3940                         continue;
3941                 if (!strcmp(set->name, i->name)) {
3942                         kfree(set->name);
3943                         set->name = NULL;
3944                         return -ENFILE;
3945                 }
3946         }
3947         return 0;
3948 }
3949
3950 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
3951 {
3952         u64 ms = be64_to_cpu(nla_get_be64(nla));
3953         u64 max = (u64)(~((u64)0));
3954
3955         max = div_u64(max, NSEC_PER_MSEC);
3956         if (ms >= max)
3957                 return -ERANGE;
3958
3959         ms *= NSEC_PER_MSEC;
3960         *result = nsecs_to_jiffies64(ms);
3961         return 0;
3962 }
3963
3964 __be64 nf_jiffies64_to_msecs(u64 input)
3965 {
3966         return cpu_to_be64(jiffies64_to_msecs(input));
3967 }
3968
3969 static int nf_tables_fill_set_concat(struct sk_buff *skb,
3970                                      const struct nft_set *set)
3971 {
3972         struct nlattr *concat, *field;
3973         int i;
3974
3975         concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
3976         if (!concat)
3977                 return -ENOMEM;
3978
3979         for (i = 0; i < set->field_count; i++) {
3980                 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
3981                 if (!field)
3982                         return -ENOMEM;
3983
3984                 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
3985                                  htonl(set->field_len[i])))
3986                         return -ENOMEM;
3987
3988                 nla_nest_end(skb, field);
3989         }
3990
3991         nla_nest_end(skb, concat);
3992
3993         return 0;
3994 }
3995
3996 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
3997                               const struct nft_set *set, u16 event, u16 flags)
3998 {
3999         struct nlmsghdr *nlh;
4000         u32 portid = ctx->portid;
4001         struct nlattr *nest;
4002         u32 seq = ctx->seq;
4003         int i;
4004
4005         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4006         nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
4007                            NFNETLINK_V0, nft_base_seq(ctx->net));
4008         if (!nlh)
4009                 goto nla_put_failure;
4010
4011         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
4012                 goto nla_put_failure;
4013         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
4014                 goto nla_put_failure;
4015         if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
4016                          NFTA_SET_PAD))
4017                 goto nla_put_failure;
4018         if (set->flags != 0)
4019                 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
4020                         goto nla_put_failure;
4021
4022         if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
4023                 goto nla_put_failure;
4024         if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
4025                 goto nla_put_failure;
4026         if (set->flags & NFT_SET_MAP) {
4027                 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
4028                         goto nla_put_failure;
4029                 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
4030                         goto nla_put_failure;
4031         }
4032         if (set->flags & NFT_SET_OBJECT &&
4033             nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
4034                 goto nla_put_failure;
4035
4036         if (set->timeout &&
4037             nla_put_be64(skb, NFTA_SET_TIMEOUT,
4038                          nf_jiffies64_to_msecs(set->timeout),
4039                          NFTA_SET_PAD))
4040                 goto nla_put_failure;
4041         if (set->gc_int &&
4042             nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
4043                 goto nla_put_failure;
4044
4045         if (set->policy != NFT_SET_POL_PERFORMANCE) {
4046                 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
4047                         goto nla_put_failure;
4048         }
4049
4050         if (set->udata &&
4051             nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
4052                 goto nla_put_failure;
4053
4054         nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
4055         if (!nest)
4056                 goto nla_put_failure;
4057         if (set->size &&
4058             nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
4059                 goto nla_put_failure;
4060
4061         if (set->field_count > 1 &&
4062             nf_tables_fill_set_concat(skb, set))
4063                 goto nla_put_failure;
4064
4065         nla_nest_end(skb, nest);
4066
4067         if (set->num_exprs == 1) {
4068                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
4069                 if (nf_tables_fill_expr_info(skb, set->exprs[0]) < 0)
4070                         goto nla_put_failure;
4071
4072                 nla_nest_end(skb, nest);
4073         } else if (set->num_exprs > 1) {
4074                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPRESSIONS);
4075                 if (nest == NULL)
4076                         goto nla_put_failure;
4077
4078                 for (i = 0; i < set->num_exprs; i++) {
4079                         if (nft_expr_dump(skb, NFTA_LIST_ELEM,
4080                                           set->exprs[i]) < 0)
4081                                 goto nla_put_failure;
4082                 }
4083                 nla_nest_end(skb, nest);
4084         }
4085
4086         nlmsg_end(skb, nlh);
4087         return 0;
4088
4089 nla_put_failure:
4090         nlmsg_trim(skb, nlh);
4091         return -1;
4092 }
4093
4094 static void nf_tables_set_notify(const struct nft_ctx *ctx,
4095                                  const struct nft_set *set, int event,
4096                                  gfp_t gfp_flags)
4097 {
4098         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4099         u32 portid = ctx->portid;
4100         struct sk_buff *skb;
4101         u16 flags = 0;
4102         int err;
4103
4104         if (!ctx->report &&
4105             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
4106                 return;
4107
4108         skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
4109         if (skb == NULL)
4110                 goto err;
4111
4112         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
4113                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
4114
4115         err = nf_tables_fill_set(skb, ctx, set, event, flags);
4116         if (err < 0) {
4117                 kfree_skb(skb);
4118                 goto err;
4119         }
4120
4121         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
4122         return;
4123 err:
4124         nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4125 }
4126
4127 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
4128 {
4129         const struct nft_set *set;
4130         unsigned int idx, s_idx = cb->args[0];
4131         struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
4132         struct net *net = sock_net(skb->sk);
4133         struct nft_ctx *ctx = cb->data, ctx_set;
4134         struct nftables_pernet *nft_net;
4135
4136         if (cb->args[1])
4137                 return skb->len;
4138
4139         rcu_read_lock();
4140         nft_net = nft_pernet(net);
4141         cb->seq = READ_ONCE(nft_net->base_seq);
4142
4143         list_for_each_entry_rcu(table, &nft_net->tables, list) {
4144                 if (ctx->family != NFPROTO_UNSPEC &&
4145                     ctx->family != table->family)
4146                         continue;
4147
4148                 if (ctx->table && ctx->table != table)
4149                         continue;
4150
4151                 if (cur_table) {
4152                         if (cur_table != table)
4153                                 continue;
4154
4155                         cur_table = NULL;
4156                 }
4157                 idx = 0;
4158                 list_for_each_entry_rcu(set, &table->sets, list) {
4159                         if (idx < s_idx)
4160                                 goto cont;
4161                         if (!nft_is_active(net, set))
4162                                 goto cont;
4163
4164                         ctx_set = *ctx;
4165                         ctx_set.table = table;
4166                         ctx_set.family = table->family;
4167
4168                         if (nf_tables_fill_set(skb, &ctx_set, set,
4169                                                NFT_MSG_NEWSET,
4170                                                NLM_F_MULTI) < 0) {
4171                                 cb->args[0] = idx;
4172                                 cb->args[2] = (unsigned long) table;
4173                                 goto done;
4174                         }
4175                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4176 cont:
4177                         idx++;
4178                 }
4179                 if (s_idx)
4180                         s_idx = 0;
4181         }
4182         cb->args[1] = 1;
4183 done:
4184         rcu_read_unlock();
4185         return skb->len;
4186 }
4187
4188 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
4189 {
4190         struct nft_ctx *ctx_dump = NULL;
4191
4192         ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
4193         if (ctx_dump == NULL)
4194                 return -ENOMEM;
4195
4196         cb->data = ctx_dump;
4197         return 0;
4198 }
4199
4200 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
4201 {
4202         kfree(cb->data);
4203         return 0;
4204 }
4205
4206 /* called with rcu_read_lock held */
4207 static int nf_tables_getset(struct sk_buff *skb, const struct nfnl_info *info,
4208                             const struct nlattr * const nla[])
4209 {
4210         struct netlink_ext_ack *extack = info->extack;
4211         u8 genmask = nft_genmask_cur(info->net);
4212         u8 family = info->nfmsg->nfgen_family;
4213         struct nft_table *table = NULL;
4214         struct net *net = info->net;
4215         const struct nft_set *set;
4216         struct sk_buff *skb2;
4217         struct nft_ctx ctx;
4218         int err;
4219
4220         if (nla[NFTA_SET_TABLE]) {
4221                 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4222                                          genmask, 0);
4223                 if (IS_ERR(table)) {
4224                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4225                         return PTR_ERR(table);
4226                 }
4227         }
4228
4229         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4230
4231         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
4232                 struct netlink_dump_control c = {
4233                         .start = nf_tables_dump_sets_start,
4234                         .dump = nf_tables_dump_sets,
4235                         .done = nf_tables_dump_sets_done,
4236                         .data = &ctx,
4237                         .module = THIS_MODULE,
4238                 };
4239
4240                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
4241         }
4242
4243         /* Only accept unspec with dump */
4244         if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4245                 return -EAFNOSUPPORT;
4246         if (!nla[NFTA_SET_TABLE])
4247                 return -EINVAL;
4248
4249         set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4250         if (IS_ERR(set))
4251                 return PTR_ERR(set);
4252
4253         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
4254         if (skb2 == NULL)
4255                 return -ENOMEM;
4256
4257         err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
4258         if (err < 0)
4259                 goto err_fill_set_info;
4260
4261         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
4262
4263 err_fill_set_info:
4264         kfree_skb(skb2);
4265         return err;
4266 }
4267
4268 static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
4269         [NFTA_SET_FIELD_LEN]    = { .type = NLA_U32 },
4270 };
4271
4272 static int nft_set_desc_concat_parse(const struct nlattr *attr,
4273                                      struct nft_set_desc *desc)
4274 {
4275         struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
4276         u32 len;
4277         int err;
4278
4279         if (desc->field_count >= ARRAY_SIZE(desc->field_len))
4280                 return -E2BIG;
4281
4282         err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
4283                                           nft_concat_policy, NULL);
4284         if (err < 0)
4285                 return err;
4286
4287         if (!tb[NFTA_SET_FIELD_LEN])
4288                 return -EINVAL;
4289
4290         len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
4291         if (!len || len > U8_MAX)
4292                 return -EINVAL;
4293
4294         desc->field_len[desc->field_count++] = len;
4295
4296         return 0;
4297 }
4298
4299 static int nft_set_desc_concat(struct nft_set_desc *desc,
4300                                const struct nlattr *nla)
4301 {
4302         struct nlattr *attr;
4303         u32 num_regs = 0;
4304         int rem, err, i;
4305
4306         nla_for_each_nested(attr, nla, rem) {
4307                 if (nla_type(attr) != NFTA_LIST_ELEM)
4308                         return -EINVAL;
4309
4310                 err = nft_set_desc_concat_parse(attr, desc);
4311                 if (err < 0)
4312                         return err;
4313         }
4314
4315         for (i = 0; i < desc->field_count; i++)
4316                 num_regs += DIV_ROUND_UP(desc->field_len[i], sizeof(u32));
4317
4318         if (num_regs > NFT_REG32_COUNT)
4319                 return -E2BIG;
4320
4321         return 0;
4322 }
4323
4324 static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
4325                                     const struct nlattr *nla)
4326 {
4327         struct nlattr *da[NFTA_SET_DESC_MAX + 1];
4328         int err;
4329
4330         err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
4331                                           nft_set_desc_policy, NULL);
4332         if (err < 0)
4333                 return err;
4334
4335         if (da[NFTA_SET_DESC_SIZE] != NULL)
4336                 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
4337         if (da[NFTA_SET_DESC_CONCAT])
4338                 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
4339
4340         return err;
4341 }
4342
4343 static int nft_set_expr_alloc(struct nft_ctx *ctx, struct nft_set *set,
4344                               const struct nlattr * const *nla,
4345                               struct nft_expr **exprs, int *num_exprs,
4346                               u32 flags)
4347 {
4348         struct nft_expr *expr;
4349         int err, i;
4350
4351         if (nla[NFTA_SET_EXPR]) {
4352                 expr = nft_set_elem_expr_alloc(ctx, set, nla[NFTA_SET_EXPR]);
4353                 if (IS_ERR(expr)) {
4354                         err = PTR_ERR(expr);
4355                         goto err_set_expr_alloc;
4356                 }
4357                 exprs[0] = expr;
4358                 (*num_exprs)++;
4359         } else if (nla[NFTA_SET_EXPRESSIONS]) {
4360                 struct nlattr *tmp;
4361                 int left;
4362
4363                 if (!(flags & NFT_SET_EXPR)) {
4364                         err = -EINVAL;
4365                         goto err_set_expr_alloc;
4366                 }
4367                 i = 0;
4368                 nla_for_each_nested(tmp, nla[NFTA_SET_EXPRESSIONS], left) {
4369                         if (i == NFT_SET_EXPR_MAX) {
4370                                 err = -E2BIG;
4371                                 goto err_set_expr_alloc;
4372                         }
4373                         if (nla_type(tmp) != NFTA_LIST_ELEM) {
4374                                 err = -EINVAL;
4375                                 goto err_set_expr_alloc;
4376                         }
4377                         expr = nft_set_elem_expr_alloc(ctx, set, tmp);
4378                         if (IS_ERR(expr)) {
4379                                 err = PTR_ERR(expr);
4380                                 goto err_set_expr_alloc;
4381                         }
4382                         exprs[i++] = expr;
4383                         (*num_exprs)++;
4384                 }
4385         }
4386
4387         return 0;
4388
4389 err_set_expr_alloc:
4390         for (i = 0; i < *num_exprs; i++)
4391                 nft_expr_destroy(ctx, exprs[i]);
4392
4393         return err;
4394 }
4395
4396 static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info,
4397                             const struct nlattr * const nla[])
4398 {
4399         struct netlink_ext_ack *extack = info->extack;
4400         u8 genmask = nft_genmask_next(info->net);
4401         u8 family = info->nfmsg->nfgen_family;
4402         const struct nft_set_ops *ops;
4403         struct net *net = info->net;
4404         struct nft_set_desc desc;
4405         struct nft_table *table;
4406         unsigned char *udata;
4407         struct nft_set *set;
4408         struct nft_ctx ctx;
4409         size_t alloc_size;
4410         int num_exprs = 0;
4411         char *name;
4412         int err, i;
4413         u16 udlen;
4414         u32 flags;
4415         u64 size;
4416
4417         if (nla[NFTA_SET_TABLE] == NULL ||
4418             nla[NFTA_SET_NAME] == NULL ||
4419             nla[NFTA_SET_KEY_LEN] == NULL ||
4420             nla[NFTA_SET_ID] == NULL)
4421                 return -EINVAL;
4422
4423         memset(&desc, 0, sizeof(desc));
4424
4425         desc.ktype = NFT_DATA_VALUE;
4426         if (nla[NFTA_SET_KEY_TYPE] != NULL) {
4427                 desc.ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
4428                 if ((desc.ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
4429                         return -EINVAL;
4430         }
4431
4432         desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
4433         if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
4434                 return -EINVAL;
4435
4436         flags = 0;
4437         if (nla[NFTA_SET_FLAGS] != NULL) {
4438                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4439                 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
4440                               NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
4441                               NFT_SET_MAP | NFT_SET_EVAL |
4442                               NFT_SET_OBJECT | NFT_SET_CONCAT | NFT_SET_EXPR))
4443                         return -EOPNOTSUPP;
4444                 /* Only one of these operations is supported */
4445                 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
4446                              (NFT_SET_MAP | NFT_SET_OBJECT))
4447                         return -EOPNOTSUPP;
4448                 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
4449                              (NFT_SET_EVAL | NFT_SET_OBJECT))
4450                         return -EOPNOTSUPP;
4451         }
4452
4453         desc.dtype = 0;
4454         if (nla[NFTA_SET_DATA_TYPE] != NULL) {
4455                 if (!(flags & NFT_SET_MAP))
4456                         return -EINVAL;
4457
4458                 desc.dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
4459                 if ((desc.dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
4460                     desc.dtype != NFT_DATA_VERDICT)
4461                         return -EINVAL;
4462
4463                 if (desc.dtype != NFT_DATA_VERDICT) {
4464                         if (nla[NFTA_SET_DATA_LEN] == NULL)
4465                                 return -EINVAL;
4466                         desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
4467                         if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
4468                                 return -EINVAL;
4469                 } else
4470                         desc.dlen = sizeof(struct nft_verdict);
4471         } else if (flags & NFT_SET_MAP)
4472                 return -EINVAL;
4473
4474         if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
4475                 if (!(flags & NFT_SET_OBJECT))
4476                         return -EINVAL;
4477
4478                 desc.objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
4479                 if (desc.objtype == NFT_OBJECT_UNSPEC ||
4480                     desc.objtype > NFT_OBJECT_MAX)
4481                         return -EOPNOTSUPP;
4482         } else if (flags & NFT_SET_OBJECT)
4483                 return -EINVAL;
4484         else
4485                 desc.objtype = NFT_OBJECT_UNSPEC;
4486
4487         desc.timeout = 0;
4488         if (nla[NFTA_SET_TIMEOUT] != NULL) {
4489                 if (!(flags & NFT_SET_TIMEOUT))
4490                         return -EINVAL;
4491
4492                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &desc.timeout);
4493                 if (err)
4494                         return err;
4495         }
4496         desc.gc_int = 0;
4497         if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
4498                 if (!(flags & NFT_SET_TIMEOUT))
4499                         return -EINVAL;
4500                 desc.gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
4501         }
4502
4503         desc.policy = NFT_SET_POL_PERFORMANCE;
4504         if (nla[NFTA_SET_POLICY] != NULL)
4505                 desc.policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
4506
4507         if (nla[NFTA_SET_DESC] != NULL) {
4508                 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
4509                 if (err < 0)
4510                         return err;
4511
4512                 if (desc.field_count > 1 && !(flags & NFT_SET_CONCAT))
4513                         return -EINVAL;
4514         } else if (flags & NFT_SET_CONCAT) {
4515                 return -EINVAL;
4516         }
4517
4518         if (nla[NFTA_SET_EXPR] || nla[NFTA_SET_EXPRESSIONS])
4519                 desc.expr = true;
4520
4521         table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask,
4522                                  NETLINK_CB(skb).portid);
4523         if (IS_ERR(table)) {
4524                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4525                 return PTR_ERR(table);
4526         }
4527
4528         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4529
4530         set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4531         if (IS_ERR(set)) {
4532                 if (PTR_ERR(set) != -ENOENT) {
4533                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4534                         return PTR_ERR(set);
4535                 }
4536         } else {
4537                 struct nft_expr *exprs[NFT_SET_EXPR_MAX] = {};
4538
4539                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
4540                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4541                         return -EEXIST;
4542                 }
4543                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
4544                         return -EOPNOTSUPP;
4545
4546                 err = nft_set_expr_alloc(&ctx, set, nla, exprs, &num_exprs, flags);
4547                 if (err < 0)
4548                         return err;
4549
4550                 for (i = 0; i < num_exprs; i++)
4551                         nft_expr_destroy(&ctx, exprs[i]);
4552
4553                 return 0;
4554         }
4555
4556         if (!(info->nlh->nlmsg_flags & NLM_F_CREATE))
4557                 return -ENOENT;
4558
4559         ops = nft_select_set_ops(&ctx, nla, &desc);
4560         if (IS_ERR(ops))
4561                 return PTR_ERR(ops);
4562
4563         udlen = 0;
4564         if (nla[NFTA_SET_USERDATA])
4565                 udlen = nla_len(nla[NFTA_SET_USERDATA]);
4566
4567         size = 0;
4568         if (ops->privsize != NULL)
4569                 size = ops->privsize(nla, &desc);
4570         alloc_size = sizeof(*set) + size + udlen;
4571         if (alloc_size < size || alloc_size > INT_MAX)
4572                 return -ENOMEM;
4573         set = kvzalloc(alloc_size, GFP_KERNEL_ACCOUNT);
4574         if (!set)
4575                 return -ENOMEM;
4576
4577         name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL_ACCOUNT);
4578         if (!name) {
4579                 err = -ENOMEM;
4580                 goto err_set_name;
4581         }
4582
4583         err = nf_tables_set_alloc_name(&ctx, set, name);
4584         kfree(name);
4585         if (err < 0)
4586                 goto err_set_name;
4587
4588         udata = NULL;
4589         if (udlen) {
4590                 udata = set->data + size;
4591                 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
4592         }
4593
4594         INIT_LIST_HEAD(&set->bindings);
4595         INIT_LIST_HEAD(&set->catchall_list);
4596         set->table = table;
4597         write_pnet(&set->net, net);
4598         set->ops = ops;
4599         set->ktype = desc.ktype;
4600         set->klen = desc.klen;
4601         set->dtype = desc.dtype;
4602         set->objtype = desc.objtype;
4603         set->dlen = desc.dlen;
4604         set->flags = flags;
4605         set->size = desc.size;
4606         set->policy = desc.policy;
4607         set->udlen = udlen;
4608         set->udata = udata;
4609         set->timeout = desc.timeout;
4610         set->gc_int = desc.gc_int;
4611
4612         set->field_count = desc.field_count;
4613         for (i = 0; i < desc.field_count; i++)
4614                 set->field_len[i] = desc.field_len[i];
4615
4616         err = ops->init(set, &desc, nla);
4617         if (err < 0)
4618                 goto err_set_init;
4619
4620         err = nft_set_expr_alloc(&ctx, set, nla, set->exprs, &num_exprs, flags);
4621         if (err < 0)
4622                 goto err_set_destroy;
4623
4624         set->num_exprs = num_exprs;
4625         set->handle = nf_tables_alloc_handle(table);
4626
4627         err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
4628         if (err < 0)
4629                 goto err_set_expr_alloc;
4630
4631         list_add_tail_rcu(&set->list, &table->sets);
4632         table->use++;
4633         return 0;
4634
4635 err_set_expr_alloc:
4636         for (i = 0; i < set->num_exprs; i++)
4637                 nft_expr_destroy(&ctx, set->exprs[i]);
4638 err_set_destroy:
4639         ops->destroy(set);
4640 err_set_init:
4641         kfree(set->name);
4642 err_set_name:
4643         kvfree(set);
4644         return err;
4645 }
4646
4647 struct nft_set_elem_catchall {
4648         struct list_head        list;
4649         struct rcu_head         rcu;
4650         void                    *elem;
4651 };
4652
4653 static void nft_set_catchall_destroy(const struct nft_ctx *ctx,
4654                                      struct nft_set *set)
4655 {
4656         struct nft_set_elem_catchall *next, *catchall;
4657
4658         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
4659                 list_del_rcu(&catchall->list);
4660                 nft_set_elem_destroy(set, catchall->elem, true);
4661                 kfree_rcu(catchall, rcu);
4662         }
4663 }
4664
4665 static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
4666 {
4667         int i;
4668
4669         if (WARN_ON(set->use > 0))
4670                 return;
4671
4672         for (i = 0; i < set->num_exprs; i++)
4673                 nft_expr_destroy(ctx, set->exprs[i]);
4674
4675         set->ops->destroy(set);
4676         nft_set_catchall_destroy(ctx, set);
4677         kfree(set->name);
4678         kvfree(set);
4679 }
4680
4681 static int nf_tables_delset(struct sk_buff *skb, const struct nfnl_info *info,
4682                             const struct nlattr * const nla[])
4683 {
4684         struct netlink_ext_ack *extack = info->extack;
4685         u8 genmask = nft_genmask_next(info->net);
4686         u8 family = info->nfmsg->nfgen_family;
4687         struct net *net = info->net;
4688         const struct nlattr *attr;
4689         struct nft_table *table;
4690         struct nft_set *set;
4691         struct nft_ctx ctx;
4692
4693         if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4694                 return -EAFNOSUPPORT;
4695
4696         table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4697                                  genmask, NETLINK_CB(skb).portid);
4698         if (IS_ERR(table)) {
4699                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4700                 return PTR_ERR(table);
4701         }
4702
4703         if (nla[NFTA_SET_HANDLE]) {
4704                 attr = nla[NFTA_SET_HANDLE];
4705                 set = nft_set_lookup_byhandle(table, attr, genmask);
4706         } else {
4707                 attr = nla[NFTA_SET_NAME];
4708                 set = nft_set_lookup(table, attr, genmask);
4709         }
4710
4711         if (IS_ERR(set)) {
4712                 NL_SET_BAD_ATTR(extack, attr);
4713                 return PTR_ERR(set);
4714         }
4715         if (set->use ||
4716             (info->nlh->nlmsg_flags & NLM_F_NONREC &&
4717              atomic_read(&set->nelems) > 0)) {
4718                 NL_SET_BAD_ATTR(extack, attr);
4719                 return -EBUSY;
4720         }
4721
4722         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4723
4724         return nft_delset(&ctx, set);
4725 }
4726
4727 static int nft_validate_register_store(const struct nft_ctx *ctx,
4728                                        enum nft_registers reg,
4729                                        const struct nft_data *data,
4730                                        enum nft_data_types type,
4731                                        unsigned int len);
4732
4733 static int nft_setelem_data_validate(const struct nft_ctx *ctx,
4734                                      struct nft_set *set,
4735                                      struct nft_set_elem *elem)
4736 {
4737         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4738         enum nft_registers dreg;
4739
4740         dreg = nft_type_to_reg(set->dtype);
4741         return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
4742                                            set->dtype == NFT_DATA_VERDICT ?
4743                                            NFT_DATA_VERDICT : NFT_DATA_VALUE,
4744                                            set->dlen);
4745 }
4746
4747 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
4748                                         struct nft_set *set,
4749                                         const struct nft_set_iter *iter,
4750                                         struct nft_set_elem *elem)
4751 {
4752         return nft_setelem_data_validate(ctx, set, elem);
4753 }
4754
4755 static int nft_set_catchall_bind_check(const struct nft_ctx *ctx,
4756                                        struct nft_set *set)
4757 {
4758         u8 genmask = nft_genmask_next(ctx->net);
4759         struct nft_set_elem_catchall *catchall;
4760         struct nft_set_elem elem;
4761         struct nft_set_ext *ext;
4762         int ret = 0;
4763
4764         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
4765                 ext = nft_set_elem_ext(set, catchall->elem);
4766                 if (!nft_set_elem_active(ext, genmask))
4767                         continue;
4768
4769                 elem.priv = catchall->elem;
4770                 ret = nft_setelem_data_validate(ctx, set, &elem);
4771                 if (ret < 0)
4772                         break;
4773         }
4774
4775         return ret;
4776 }
4777
4778 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
4779                        struct nft_set_binding *binding)
4780 {
4781         struct nft_set_binding *i;
4782         struct nft_set_iter iter;
4783
4784         if (set->use == UINT_MAX)
4785                 return -EOVERFLOW;
4786
4787         if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
4788                 return -EBUSY;
4789
4790         if (binding->flags & NFT_SET_MAP) {
4791                 /* If the set is already bound to the same chain all
4792                  * jumps are already validated for that chain.
4793                  */
4794                 list_for_each_entry(i, &set->bindings, list) {
4795                         if (i->flags & NFT_SET_MAP &&
4796                             i->chain == binding->chain)
4797                                 goto bind;
4798                 }
4799
4800                 iter.genmask    = nft_genmask_next(ctx->net);
4801                 iter.skip       = 0;
4802                 iter.count      = 0;
4803                 iter.err        = 0;
4804                 iter.fn         = nf_tables_bind_check_setelem;
4805
4806                 set->ops->walk(ctx, set, &iter);
4807                 if (!iter.err)
4808                         iter.err = nft_set_catchall_bind_check(ctx, set);
4809
4810                 if (iter.err < 0)
4811                         return iter.err;
4812         }
4813 bind:
4814         binding->chain = ctx->chain;
4815         list_add_tail_rcu(&binding->list, &set->bindings);
4816         nft_set_trans_bind(ctx, set);
4817         set->use++;
4818
4819         return 0;
4820 }
4821 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
4822
4823 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
4824                                  struct nft_set_binding *binding, bool event)
4825 {
4826         list_del_rcu(&binding->list);
4827
4828         if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
4829                 list_del_rcu(&set->list);
4830                 if (event)
4831                         nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
4832                                              GFP_KERNEL);
4833         }
4834 }
4835
4836 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
4837                               struct nft_set_binding *binding,
4838                               enum nft_trans_phase phase)
4839 {
4840         switch (phase) {
4841         case NFT_TRANS_PREPARE:
4842                 set->use--;
4843                 return;
4844         case NFT_TRANS_ABORT:
4845         case NFT_TRANS_RELEASE:
4846                 set->use--;
4847                 fallthrough;
4848         default:
4849                 nf_tables_unbind_set(ctx, set, binding,
4850                                      phase == NFT_TRANS_COMMIT);
4851         }
4852 }
4853 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
4854
4855 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
4856 {
4857         if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
4858                 nft_set_destroy(ctx, set);
4859 }
4860 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
4861
4862 const struct nft_set_ext_type nft_set_ext_types[] = {
4863         [NFT_SET_EXT_KEY]               = {
4864                 .align  = __alignof__(u32),
4865         },
4866         [NFT_SET_EXT_DATA]              = {
4867                 .align  = __alignof__(u32),
4868         },
4869         [NFT_SET_EXT_EXPRESSIONS]       = {
4870                 .align  = __alignof__(struct nft_set_elem_expr),
4871         },
4872         [NFT_SET_EXT_OBJREF]            = {
4873                 .len    = sizeof(struct nft_object *),
4874                 .align  = __alignof__(struct nft_object *),
4875         },
4876         [NFT_SET_EXT_FLAGS]             = {
4877                 .len    = sizeof(u8),
4878                 .align  = __alignof__(u8),
4879         },
4880         [NFT_SET_EXT_TIMEOUT]           = {
4881                 .len    = sizeof(u64),
4882                 .align  = __alignof__(u64),
4883         },
4884         [NFT_SET_EXT_EXPIRATION]        = {
4885                 .len    = sizeof(u64),
4886                 .align  = __alignof__(u64),
4887         },
4888         [NFT_SET_EXT_USERDATA]          = {
4889                 .len    = sizeof(struct nft_userdata),
4890                 .align  = __alignof__(struct nft_userdata),
4891         },
4892         [NFT_SET_EXT_KEY_END]           = {
4893                 .align  = __alignof__(u32),
4894         },
4895 };
4896
4897 /*
4898  * Set elements
4899  */
4900
4901 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
4902         [NFTA_SET_ELEM_KEY]             = { .type = NLA_NESTED },
4903         [NFTA_SET_ELEM_DATA]            = { .type = NLA_NESTED },
4904         [NFTA_SET_ELEM_FLAGS]           = { .type = NLA_U32 },
4905         [NFTA_SET_ELEM_TIMEOUT]         = { .type = NLA_U64 },
4906         [NFTA_SET_ELEM_EXPIRATION]      = { .type = NLA_U64 },
4907         [NFTA_SET_ELEM_USERDATA]        = { .type = NLA_BINARY,
4908                                             .len = NFT_USERDATA_MAXLEN },
4909         [NFTA_SET_ELEM_EXPR]            = { .type = NLA_NESTED },
4910         [NFTA_SET_ELEM_OBJREF]          = { .type = NLA_STRING,
4911                                             .len = NFT_OBJ_MAXNAMELEN - 1 },
4912         [NFTA_SET_ELEM_KEY_END]         = { .type = NLA_NESTED },
4913         [NFTA_SET_ELEM_EXPRESSIONS]     = { .type = NLA_NESTED },
4914 };
4915
4916 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
4917         [NFTA_SET_ELEM_LIST_TABLE]      = { .type = NLA_STRING,
4918                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
4919         [NFTA_SET_ELEM_LIST_SET]        = { .type = NLA_STRING,
4920                                             .len = NFT_SET_MAXNAMELEN - 1 },
4921         [NFTA_SET_ELEM_LIST_ELEMENTS]   = { .type = NLA_NESTED },
4922         [NFTA_SET_ELEM_LIST_SET_ID]     = { .type = NLA_U32 },
4923 };
4924
4925 static int nft_set_elem_expr_dump(struct sk_buff *skb,
4926                                   const struct nft_set *set,
4927                                   const struct nft_set_ext *ext)
4928 {
4929         struct nft_set_elem_expr *elem_expr;
4930         u32 size, num_exprs = 0;
4931         struct nft_expr *expr;
4932         struct nlattr *nest;
4933
4934         elem_expr = nft_set_ext_expr(ext);
4935         nft_setelem_expr_foreach(expr, elem_expr, size)
4936                 num_exprs++;
4937
4938         if (num_exprs == 1) {
4939                 expr = nft_setelem_expr_at(elem_expr, 0);
4940                 if (nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, expr) < 0)
4941                         return -1;
4942
4943                 return 0;
4944         } else if (num_exprs > 1) {
4945                 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_EXPRESSIONS);
4946                 if (nest == NULL)
4947                         goto nla_put_failure;
4948
4949                 nft_setelem_expr_foreach(expr, elem_expr, size) {
4950                         expr = nft_setelem_expr_at(elem_expr, size);
4951                         if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
4952                                 goto nla_put_failure;
4953                 }
4954                 nla_nest_end(skb, nest);
4955         }
4956         return 0;
4957
4958 nla_put_failure:
4959         return -1;
4960 }
4961
4962 static int nf_tables_fill_setelem(struct sk_buff *skb,
4963                                   const struct nft_set *set,
4964                                   const struct nft_set_elem *elem)
4965 {
4966         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4967         unsigned char *b = skb_tail_pointer(skb);
4968         struct nlattr *nest;
4969
4970         nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
4971         if (nest == NULL)
4972                 goto nla_put_failure;
4973
4974         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
4975             nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
4976                           NFT_DATA_VALUE, set->klen) < 0)
4977                 goto nla_put_failure;
4978
4979         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
4980             nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
4981                           NFT_DATA_VALUE, set->klen) < 0)
4982                 goto nla_put_failure;
4983
4984         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
4985             nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
4986                           set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
4987                           set->dlen) < 0)
4988                 goto nla_put_failure;
4989
4990         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS) &&
4991             nft_set_elem_expr_dump(skb, set, ext))
4992                 goto nla_put_failure;
4993
4994         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
4995             nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
4996                            (*nft_set_ext_obj(ext))->key.name) < 0)
4997                 goto nla_put_failure;
4998
4999         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5000             nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
5001                          htonl(*nft_set_ext_flags(ext))))
5002                 goto nla_put_failure;
5003
5004         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
5005             nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
5006                          nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
5007                          NFTA_SET_ELEM_PAD))
5008                 goto nla_put_failure;
5009
5010         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5011                 u64 expires, now = get_jiffies_64();
5012
5013                 expires = *nft_set_ext_expiration(ext);
5014                 if (time_before64(now, expires))
5015                         expires -= now;
5016                 else
5017                         expires = 0;
5018
5019                 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
5020                                  nf_jiffies64_to_msecs(expires),
5021                                  NFTA_SET_ELEM_PAD))
5022                         goto nla_put_failure;
5023         }
5024
5025         if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
5026                 struct nft_userdata *udata;
5027
5028                 udata = nft_set_ext_userdata(ext);
5029                 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
5030                             udata->len + 1, udata->data))
5031                         goto nla_put_failure;
5032         }
5033
5034         nla_nest_end(skb, nest);
5035         return 0;
5036
5037 nla_put_failure:
5038         nlmsg_trim(skb, b);
5039         return -EMSGSIZE;
5040 }
5041
5042 struct nft_set_dump_args {
5043         const struct netlink_callback   *cb;
5044         struct nft_set_iter             iter;
5045         struct sk_buff                  *skb;
5046 };
5047
5048 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
5049                                   struct nft_set *set,
5050                                   const struct nft_set_iter *iter,
5051                                   struct nft_set_elem *elem)
5052 {
5053         struct nft_set_dump_args *args;
5054
5055         args = container_of(iter, struct nft_set_dump_args, iter);
5056         return nf_tables_fill_setelem(args->skb, set, elem);
5057 }
5058
5059 struct nft_set_dump_ctx {
5060         const struct nft_set    *set;
5061         struct nft_ctx          ctx;
5062 };
5063
5064 static int nft_set_catchall_dump(struct net *net, struct sk_buff *skb,
5065                                  const struct nft_set *set)
5066 {
5067         struct nft_set_elem_catchall *catchall;
5068         u8 genmask = nft_genmask_cur(net);
5069         struct nft_set_elem elem;
5070         struct nft_set_ext *ext;
5071         int ret = 0;
5072
5073         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5074                 ext = nft_set_elem_ext(set, catchall->elem);
5075                 if (!nft_set_elem_active(ext, genmask) ||
5076                     nft_set_elem_expired(ext))
5077                         continue;
5078
5079                 elem.priv = catchall->elem;
5080                 ret = nf_tables_fill_setelem(skb, set, &elem);
5081                 break;
5082         }
5083
5084         return ret;
5085 }
5086
5087 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
5088 {
5089         struct nft_set_dump_ctx *dump_ctx = cb->data;
5090         struct net *net = sock_net(skb->sk);
5091         struct nftables_pernet *nft_net;
5092         struct nft_table *table;
5093         struct nft_set *set;
5094         struct nft_set_dump_args args;
5095         bool set_found = false;
5096         struct nlmsghdr *nlh;
5097         struct nlattr *nest;
5098         u32 portid, seq;
5099         int event;
5100
5101         rcu_read_lock();
5102         nft_net = nft_pernet(net);
5103         cb->seq = READ_ONCE(nft_net->base_seq);
5104
5105         list_for_each_entry_rcu(table, &nft_net->tables, list) {
5106                 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
5107                     dump_ctx->ctx.family != table->family)
5108                         continue;
5109
5110                 if (table != dump_ctx->ctx.table)
5111                         continue;
5112
5113                 list_for_each_entry_rcu(set, &table->sets, list) {
5114                         if (set == dump_ctx->set) {
5115                                 set_found = true;
5116                                 break;
5117                         }
5118                 }
5119                 break;
5120         }
5121
5122         if (!set_found) {
5123                 rcu_read_unlock();
5124                 return -ENOENT;
5125         }
5126
5127         event  = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
5128         portid = NETLINK_CB(cb->skb).portid;
5129         seq    = cb->nlh->nlmsg_seq;
5130
5131         nlh = nfnl_msg_put(skb, portid, seq, event, NLM_F_MULTI,
5132                            table->family, NFNETLINK_V0, nft_base_seq(net));
5133         if (!nlh)
5134                 goto nla_put_failure;
5135
5136         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
5137                 goto nla_put_failure;
5138         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
5139                 goto nla_put_failure;
5140
5141         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5142         if (nest == NULL)
5143                 goto nla_put_failure;
5144
5145         args.cb                 = cb;
5146         args.skb                = skb;
5147         args.iter.genmask       = nft_genmask_cur(net);
5148         args.iter.skip          = cb->args[0];
5149         args.iter.count         = 0;
5150         args.iter.err           = 0;
5151         args.iter.fn            = nf_tables_dump_setelem;
5152         set->ops->walk(&dump_ctx->ctx, set, &args.iter);
5153
5154         if (!args.iter.err && args.iter.count == cb->args[0])
5155                 args.iter.err = nft_set_catchall_dump(net, skb, set);
5156         rcu_read_unlock();
5157
5158         nla_nest_end(skb, nest);
5159         nlmsg_end(skb, nlh);
5160
5161         if (args.iter.err && args.iter.err != -EMSGSIZE)
5162                 return args.iter.err;
5163         if (args.iter.count == cb->args[0])
5164                 return 0;
5165
5166         cb->args[0] = args.iter.count;
5167         return skb->len;
5168
5169 nla_put_failure:
5170         rcu_read_unlock();
5171         return -ENOSPC;
5172 }
5173
5174 static int nf_tables_dump_set_start(struct netlink_callback *cb)
5175 {
5176         struct nft_set_dump_ctx *dump_ctx = cb->data;
5177
5178         cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
5179
5180         return cb->data ? 0 : -ENOMEM;
5181 }
5182
5183 static int nf_tables_dump_set_done(struct netlink_callback *cb)
5184 {
5185         kfree(cb->data);
5186         return 0;
5187 }
5188
5189 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
5190                                        const struct nft_ctx *ctx, u32 seq,
5191                                        u32 portid, int event, u16 flags,
5192                                        const struct nft_set *set,
5193                                        const struct nft_set_elem *elem)
5194 {
5195         struct nlmsghdr *nlh;
5196         struct nlattr *nest;
5197         int err;
5198
5199         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5200         nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
5201                            NFNETLINK_V0, nft_base_seq(ctx->net));
5202         if (!nlh)
5203                 goto nla_put_failure;
5204
5205         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
5206                 goto nla_put_failure;
5207         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
5208                 goto nla_put_failure;
5209
5210         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5211         if (nest == NULL)
5212                 goto nla_put_failure;
5213
5214         err = nf_tables_fill_setelem(skb, set, elem);
5215         if (err < 0)
5216                 goto nla_put_failure;
5217
5218         nla_nest_end(skb, nest);
5219
5220         nlmsg_end(skb, nlh);
5221         return 0;
5222
5223 nla_put_failure:
5224         nlmsg_trim(skb, nlh);
5225         return -1;
5226 }
5227
5228 static int nft_setelem_parse_flags(const struct nft_set *set,
5229                                    const struct nlattr *attr, u32 *flags)
5230 {
5231         if (attr == NULL)
5232                 return 0;
5233
5234         *flags = ntohl(nla_get_be32(attr));
5235         if (*flags & ~(NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5236                 return -EOPNOTSUPP;
5237         if (!(set->flags & NFT_SET_INTERVAL) &&
5238             *flags & NFT_SET_ELEM_INTERVAL_END)
5239                 return -EINVAL;
5240         if ((*flags & (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL)) ==
5241             (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5242                 return -EINVAL;
5243
5244         return 0;
5245 }
5246
5247 static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set,
5248                                  struct nft_data *key, struct nlattr *attr)
5249 {
5250         struct nft_data_desc desc = {
5251                 .type   = NFT_DATA_VALUE,
5252                 .size   = NFT_DATA_VALUE_MAXLEN,
5253                 .len    = set->klen,
5254         };
5255
5256         return nft_data_init(ctx, key, &desc, attr);
5257 }
5258
5259 static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
5260                                   struct nft_data_desc *desc,
5261                                   struct nft_data *data,
5262                                   struct nlattr *attr)
5263 {
5264         u32 dtype;
5265
5266         if (set->dtype == NFT_DATA_VERDICT)
5267                 dtype = NFT_DATA_VERDICT;
5268         else
5269                 dtype = NFT_DATA_VALUE;
5270
5271         desc->type = dtype;
5272         desc->size = NFT_DATA_VALUE_MAXLEN;
5273         desc->len = set->dlen;
5274         desc->flags = NFT_DATA_DESC_SETELEM;
5275
5276         return nft_data_init(ctx, data, desc, attr);
5277 }
5278
5279 static void *nft_setelem_catchall_get(const struct net *net,
5280                                       const struct nft_set *set)
5281 {
5282         struct nft_set_elem_catchall *catchall;
5283         u8 genmask = nft_genmask_cur(net);
5284         struct nft_set_ext *ext;
5285         void *priv = NULL;
5286
5287         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5288                 ext = nft_set_elem_ext(set, catchall->elem);
5289                 if (!nft_set_elem_active(ext, genmask) ||
5290                     nft_set_elem_expired(ext))
5291                         continue;
5292
5293                 priv = catchall->elem;
5294                 break;
5295         }
5296
5297         return priv;
5298 }
5299
5300 static int nft_setelem_get(struct nft_ctx *ctx, struct nft_set *set,
5301                            struct nft_set_elem *elem, u32 flags)
5302 {
5303         void *priv;
5304
5305         if (!(flags & NFT_SET_ELEM_CATCHALL)) {
5306                 priv = set->ops->get(ctx->net, set, elem, flags);
5307                 if (IS_ERR(priv))
5308                         return PTR_ERR(priv);
5309         } else {
5310                 priv = nft_setelem_catchall_get(ctx->net, set);
5311                 if (!priv)
5312                         return -ENOENT;
5313         }
5314         elem->priv = priv;
5315
5316         return 0;
5317 }
5318
5319 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5320                             const struct nlattr *attr)
5321 {
5322         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5323         struct nft_set_elem elem;
5324         struct sk_buff *skb;
5325         uint32_t flags = 0;
5326         int err;
5327
5328         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5329                                           nft_set_elem_policy, NULL);
5330         if (err < 0)
5331                 return err;
5332
5333         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5334         if (err < 0)
5335                 return err;
5336
5337         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
5338                 return -EINVAL;
5339
5340         if (nla[NFTA_SET_ELEM_KEY]) {
5341                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5342                                             nla[NFTA_SET_ELEM_KEY]);
5343                 if (err < 0)
5344                         return err;
5345         }
5346
5347         if (nla[NFTA_SET_ELEM_KEY_END]) {
5348                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5349                                             nla[NFTA_SET_ELEM_KEY_END]);
5350                 if (err < 0)
5351                         return err;
5352         }
5353
5354         err = nft_setelem_get(ctx, set, &elem, flags);
5355         if (err < 0)
5356                 return err;
5357
5358         err = -ENOMEM;
5359         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
5360         if (skb == NULL)
5361                 return err;
5362
5363         err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
5364                                           NFT_MSG_NEWSETELEM, 0, set, &elem);
5365         if (err < 0)
5366                 goto err_fill_setelem;
5367
5368         return nfnetlink_unicast(skb, ctx->net, ctx->portid);
5369
5370 err_fill_setelem:
5371         kfree_skb(skb);
5372         return err;
5373 }
5374
5375 /* called with rcu_read_lock held */
5376 static int nf_tables_getsetelem(struct sk_buff *skb,
5377                                 const struct nfnl_info *info,
5378                                 const struct nlattr * const nla[])
5379 {
5380         struct netlink_ext_ack *extack = info->extack;
5381         u8 genmask = nft_genmask_cur(info->net);
5382         u8 family = info->nfmsg->nfgen_family;
5383         struct net *net = info->net;
5384         struct nft_table *table;
5385         struct nft_set *set;
5386         struct nlattr *attr;
5387         struct nft_ctx ctx;
5388         int rem, err = 0;
5389
5390         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
5391                                  genmask, NETLINK_CB(skb).portid);
5392         if (IS_ERR(table)) {
5393                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
5394                 return PTR_ERR(table);
5395         }
5396
5397         set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
5398         if (IS_ERR(set))
5399                 return PTR_ERR(set);
5400
5401         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5402
5403         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
5404                 struct netlink_dump_control c = {
5405                         .start = nf_tables_dump_set_start,
5406                         .dump = nf_tables_dump_set,
5407                         .done = nf_tables_dump_set_done,
5408                         .module = THIS_MODULE,
5409                 };
5410                 struct nft_set_dump_ctx dump_ctx = {
5411                         .set = set,
5412                         .ctx = ctx,
5413                 };
5414
5415                 c.data = &dump_ctx;
5416                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
5417         }
5418
5419         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
5420                 return -EINVAL;
5421
5422         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5423                 err = nft_get_set_elem(&ctx, set, attr);
5424                 if (err < 0) {
5425                         NL_SET_BAD_ATTR(extack, attr);
5426                         break;
5427                 }
5428         }
5429
5430         return err;
5431 }
5432
5433 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
5434                                      const struct nft_set *set,
5435                                      const struct nft_set_elem *elem,
5436                                      int event)
5437 {
5438         struct nftables_pernet *nft_net;
5439         struct net *net = ctx->net;
5440         u32 portid = ctx->portid;
5441         struct sk_buff *skb;
5442         u16 flags = 0;
5443         int err;
5444
5445         if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
5446                 return;
5447
5448         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
5449         if (skb == NULL)
5450                 goto err;
5451
5452         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
5453                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
5454
5455         err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
5456                                           set, elem);
5457         if (err < 0) {
5458                 kfree_skb(skb);
5459                 goto err;
5460         }
5461
5462         nft_net = nft_pernet(net);
5463         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
5464         return;
5465 err:
5466         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
5467 }
5468
5469 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
5470                                               int msg_type,
5471                                               struct nft_set *set)
5472 {
5473         struct nft_trans *trans;
5474
5475         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
5476         if (trans == NULL)
5477                 return NULL;
5478
5479         nft_trans_elem_set(trans) = set;
5480         return trans;
5481 }
5482
5483 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
5484                                          const struct nft_set *set,
5485                                          const struct nlattr *attr)
5486 {
5487         struct nft_expr *expr;
5488         int err;
5489
5490         expr = nft_expr_init(ctx, attr);
5491         if (IS_ERR(expr))
5492                 return expr;
5493
5494         err = -EOPNOTSUPP;
5495         if (expr->ops->type->flags & NFT_EXPR_GC) {
5496                 if (set->flags & NFT_SET_TIMEOUT)
5497                         goto err_set_elem_expr;
5498                 if (!set->ops->gc_init)
5499                         goto err_set_elem_expr;
5500                 set->ops->gc_init(set);
5501         }
5502
5503         return expr;
5504
5505 err_set_elem_expr:
5506         nft_expr_destroy(ctx, expr);
5507         return ERR_PTR(err);
5508 }
5509
5510 static int nft_set_ext_check(const struct nft_set_ext_tmpl *tmpl, u8 id, u32 len)
5511 {
5512         len += nft_set_ext_types[id].len;
5513         if (len > tmpl->ext_len[id] ||
5514             len > U8_MAX)
5515                 return -1;
5516
5517         return 0;
5518 }
5519
5520 static int nft_set_ext_memcpy(const struct nft_set_ext_tmpl *tmpl, u8 id,
5521                               void *to, const void *from, u32 len)
5522 {
5523         if (nft_set_ext_check(tmpl, id, len) < 0)
5524                 return -1;
5525
5526         memcpy(to, from, len);
5527
5528         return 0;
5529 }
5530
5531 void *nft_set_elem_init(const struct nft_set *set,
5532                         const struct nft_set_ext_tmpl *tmpl,
5533                         const u32 *key, const u32 *key_end,
5534                         const u32 *data, u64 timeout, u64 expiration, gfp_t gfp)
5535 {
5536         struct nft_set_ext *ext;
5537         void *elem;
5538
5539         elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
5540         if (elem == NULL)
5541                 return ERR_PTR(-ENOMEM);
5542
5543         ext = nft_set_elem_ext(set, elem);
5544         nft_set_ext_init(ext, tmpl);
5545
5546         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
5547             nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY,
5548                                nft_set_ext_key(ext), key, set->klen) < 0)
5549                 goto err_ext_check;
5550
5551         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
5552             nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY_END,
5553                                nft_set_ext_key_end(ext), key_end, set->klen) < 0)
5554                 goto err_ext_check;
5555
5556         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5557             nft_set_ext_memcpy(tmpl, NFT_SET_EXT_DATA,
5558                                nft_set_ext_data(ext), data, set->dlen) < 0)
5559                 goto err_ext_check;
5560
5561         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5562                 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
5563                 if (expiration == 0)
5564                         *nft_set_ext_expiration(ext) += timeout;
5565         }
5566         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
5567                 *nft_set_ext_timeout(ext) = timeout;
5568
5569         return elem;
5570
5571 err_ext_check:
5572         kfree(elem);
5573
5574         return ERR_PTR(-EINVAL);
5575 }
5576
5577 static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5578                                         struct nft_expr *expr)
5579 {
5580         if (expr->ops->destroy_clone) {
5581                 expr->ops->destroy_clone(ctx, expr);
5582                 module_put(expr->ops->type->owner);
5583         } else {
5584                 nf_tables_expr_destroy(ctx, expr);
5585         }
5586 }
5587
5588 static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5589                                       struct nft_set_elem_expr *elem_expr)
5590 {
5591         struct nft_expr *expr;
5592         u32 size;
5593
5594         nft_setelem_expr_foreach(expr, elem_expr, size)
5595                 __nft_set_elem_expr_destroy(ctx, expr);
5596 }
5597
5598 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
5599                           bool destroy_expr)
5600 {
5601         struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5602         struct nft_ctx ctx = {
5603                 .net    = read_pnet(&set->net),
5604                 .family = set->table->family,
5605         };
5606
5607         nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
5608         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5609                 nft_data_release(nft_set_ext_data(ext), set->dtype);
5610         if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
5611                 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));
5612
5613         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5614                 (*nft_set_ext_obj(ext))->use--;
5615         kfree(elem);
5616 }
5617 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
5618
5619 /* Only called from commit path, nft_setelem_data_deactivate() already deals
5620  * with the refcounting from the preparation phase.
5621  */
5622 static void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
5623                                        const struct nft_set *set, void *elem)
5624 {
5625         struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5626
5627         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
5628                 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
5629
5630         kfree(elem);
5631 }
5632
5633 int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
5634                             struct nft_expr *expr_array[])
5635 {
5636         struct nft_expr *expr;
5637         int err, i, k;
5638
5639         for (i = 0; i < set->num_exprs; i++) {
5640                 expr = kzalloc(set->exprs[i]->ops->size, GFP_KERNEL_ACCOUNT);
5641                 if (!expr)
5642                         goto err_expr;
5643
5644                 err = nft_expr_clone(expr, set->exprs[i]);
5645                 if (err < 0) {
5646                         kfree(expr);
5647                         goto err_expr;
5648                 }
5649                 expr_array[i] = expr;
5650         }
5651
5652         return 0;
5653
5654 err_expr:
5655         for (k = i - 1; k >= 0; k--)
5656                 nft_expr_destroy(ctx, expr_array[k]);
5657
5658         return -ENOMEM;
5659 }
5660
5661 static int nft_set_elem_expr_setup(struct nft_ctx *ctx,
5662                                    const struct nft_set_ext_tmpl *tmpl,
5663                                    const struct nft_set_ext *ext,
5664                                    struct nft_expr *expr_array[],
5665                                    u32 num_exprs)
5666 {
5667         struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
5668         u32 len = sizeof(struct nft_set_elem_expr);
5669         struct nft_expr *expr;
5670         int i, err;
5671
5672         if (num_exprs == 0)
5673                 return 0;
5674
5675         for (i = 0; i < num_exprs; i++)
5676                 len += expr_array[i]->ops->size;
5677
5678         if (nft_set_ext_check(tmpl, NFT_SET_EXT_EXPRESSIONS, len) < 0)
5679                 return -EINVAL;
5680
5681         for (i = 0; i < num_exprs; i++) {
5682                 expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
5683                 err = nft_expr_clone(expr, expr_array[i]);
5684                 if (err < 0)
5685                         goto err_elem_expr_setup;
5686
5687                 elem_expr->size += expr_array[i]->ops->size;
5688                 nft_expr_destroy(ctx, expr_array[i]);
5689                 expr_array[i] = NULL;
5690         }
5691
5692         return 0;
5693
5694 err_elem_expr_setup:
5695         for (; i < num_exprs; i++) {
5696                 nft_expr_destroy(ctx, expr_array[i]);
5697                 expr_array[i] = NULL;
5698         }
5699
5700         return -ENOMEM;
5701 }
5702
5703 struct nft_set_ext *nft_set_catchall_lookup(const struct net *net,
5704                                             const struct nft_set *set)
5705 {
5706         struct nft_set_elem_catchall *catchall;
5707         u8 genmask = nft_genmask_cur(net);
5708         struct nft_set_ext *ext;
5709
5710         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5711                 ext = nft_set_elem_ext(set, catchall->elem);
5712                 if (nft_set_elem_active(ext, genmask) &&
5713                     !nft_set_elem_expired(ext))
5714                         return ext;
5715         }
5716
5717         return NULL;
5718 }
5719 EXPORT_SYMBOL_GPL(nft_set_catchall_lookup);
5720
5721 void *nft_set_catchall_gc(const struct nft_set *set)
5722 {
5723         struct nft_set_elem_catchall *catchall, *next;
5724         struct nft_set_ext *ext;
5725         void *elem = NULL;
5726
5727         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5728                 ext = nft_set_elem_ext(set, catchall->elem);
5729
5730                 if (!nft_set_elem_expired(ext) ||
5731                     nft_set_elem_mark_busy(ext))
5732                         continue;
5733
5734                 elem = catchall->elem;
5735                 list_del_rcu(&catchall->list);
5736                 kfree_rcu(catchall, rcu);
5737                 break;
5738         }
5739
5740         return elem;
5741 }
5742 EXPORT_SYMBOL_GPL(nft_set_catchall_gc);
5743
5744 static int nft_setelem_catchall_insert(const struct net *net,
5745                                        struct nft_set *set,
5746                                        const struct nft_set_elem *elem,
5747                                        struct nft_set_ext **pext)
5748 {
5749         struct nft_set_elem_catchall *catchall;
5750         u8 genmask = nft_genmask_next(net);
5751         struct nft_set_ext *ext;
5752
5753         list_for_each_entry(catchall, &set->catchall_list, list) {
5754                 ext = nft_set_elem_ext(set, catchall->elem);
5755                 if (nft_set_elem_active(ext, genmask)) {
5756                         *pext = ext;
5757                         return -EEXIST;
5758                 }
5759         }
5760
5761         catchall = kmalloc(sizeof(*catchall), GFP_KERNEL);
5762         if (!catchall)
5763                 return -ENOMEM;
5764
5765         catchall->elem = elem->priv;
5766         list_add_tail_rcu(&catchall->list, &set->catchall_list);
5767
5768         return 0;
5769 }
5770
5771 static int nft_setelem_insert(const struct net *net,
5772                               struct nft_set *set,
5773                               const struct nft_set_elem *elem,
5774                               struct nft_set_ext **ext, unsigned int flags)
5775 {
5776         int ret;
5777
5778         if (flags & NFT_SET_ELEM_CATCHALL)
5779                 ret = nft_setelem_catchall_insert(net, set, elem, ext);
5780         else
5781                 ret = set->ops->insert(net, set, elem, ext);
5782
5783         return ret;
5784 }
5785
5786 static bool nft_setelem_is_catchall(const struct nft_set *set,
5787                                     const struct nft_set_elem *elem)
5788 {
5789         struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5790
5791         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5792             *nft_set_ext_flags(ext) & NFT_SET_ELEM_CATCHALL)
5793                 return true;
5794
5795         return false;
5796 }
5797
5798 static void nft_setelem_activate(struct net *net, struct nft_set *set,
5799                                  struct nft_set_elem *elem)
5800 {
5801         struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5802
5803         if (nft_setelem_is_catchall(set, elem)) {
5804                 nft_set_elem_change_active(net, set, ext);
5805                 nft_set_elem_clear_busy(ext);
5806         } else {
5807                 set->ops->activate(net, set, elem);
5808         }
5809 }
5810
5811 static int nft_setelem_catchall_deactivate(const struct net *net,
5812                                            struct nft_set *set,
5813                                            struct nft_set_elem *elem)
5814 {
5815         struct nft_set_elem_catchall *catchall;
5816         struct nft_set_ext *ext;
5817
5818         list_for_each_entry(catchall, &set->catchall_list, list) {
5819                 ext = nft_set_elem_ext(set, catchall->elem);
5820                 if (!nft_is_active(net, ext) ||
5821                     nft_set_elem_mark_busy(ext))
5822                         continue;
5823
5824                 kfree(elem->priv);
5825                 elem->priv = catchall->elem;
5826                 nft_set_elem_change_active(net, set, ext);
5827                 return 0;
5828         }
5829
5830         return -ENOENT;
5831 }
5832
5833 static int __nft_setelem_deactivate(const struct net *net,
5834                                     struct nft_set *set,
5835                                     struct nft_set_elem *elem)
5836 {
5837         void *priv;
5838
5839         priv = set->ops->deactivate(net, set, elem);
5840         if (!priv)
5841                 return -ENOENT;
5842
5843         kfree(elem->priv);
5844         elem->priv = priv;
5845         set->ndeact++;
5846
5847         return 0;
5848 }
5849
5850 static int nft_setelem_deactivate(const struct net *net,
5851                                   struct nft_set *set,
5852                                   struct nft_set_elem *elem, u32 flags)
5853 {
5854         int ret;
5855
5856         if (flags & NFT_SET_ELEM_CATCHALL)
5857                 ret = nft_setelem_catchall_deactivate(net, set, elem);
5858         else
5859                 ret = __nft_setelem_deactivate(net, set, elem);
5860
5861         return ret;
5862 }
5863
5864 static void nft_setelem_catchall_remove(const struct net *net,
5865                                         const struct nft_set *set,
5866                                         const struct nft_set_elem *elem)
5867 {
5868         struct nft_set_elem_catchall *catchall, *next;
5869
5870         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5871                 if (catchall->elem == elem->priv) {
5872                         list_del_rcu(&catchall->list);
5873                         kfree_rcu(catchall, rcu);
5874                         break;
5875                 }
5876         }
5877 }
5878
5879 static void nft_setelem_remove(const struct net *net,
5880                                const struct nft_set *set,
5881                                const struct nft_set_elem *elem)
5882 {
5883         if (nft_setelem_is_catchall(set, elem))
5884                 nft_setelem_catchall_remove(net, set, elem);
5885         else
5886                 set->ops->remove(net, set, elem);
5887 }
5888
5889 static bool nft_setelem_valid_key_end(const struct nft_set *set,
5890                                       struct nlattr **nla, u32 flags)
5891 {
5892         if ((set->flags & (NFT_SET_CONCAT | NFT_SET_INTERVAL)) ==
5893                           (NFT_SET_CONCAT | NFT_SET_INTERVAL)) {
5894                 if (flags & NFT_SET_ELEM_INTERVAL_END)
5895                         return false;
5896
5897                 if (nla[NFTA_SET_ELEM_KEY_END] &&
5898                     flags & NFT_SET_ELEM_CATCHALL)
5899                         return false;
5900         } else {
5901                 if (nla[NFTA_SET_ELEM_KEY_END])
5902                         return false;
5903         }
5904
5905         return true;
5906 }
5907
5908 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5909                             const struct nlattr *attr, u32 nlmsg_flags)
5910 {
5911         struct nft_expr *expr_array[NFT_SET_EXPR_MAX] = {};
5912         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5913         u8 genmask = nft_genmask_next(ctx->net);
5914         u32 flags = 0, size = 0, num_exprs = 0;
5915         struct nft_set_ext_tmpl tmpl;
5916         struct nft_set_ext *ext, *ext2;
5917         struct nft_set_elem elem;
5918         struct nft_set_binding *binding;
5919         struct nft_object *obj = NULL;
5920         struct nft_userdata *udata;
5921         struct nft_data_desc desc;
5922         enum nft_registers dreg;
5923         struct nft_trans *trans;
5924         u64 timeout;
5925         u64 expiration;
5926         int err, i;
5927         u8 ulen;
5928
5929         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5930                                           nft_set_elem_policy, NULL);
5931         if (err < 0)
5932                 return err;
5933
5934         nft_set_ext_prepare(&tmpl);
5935
5936         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5937         if (err < 0)
5938                 return err;
5939
5940         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
5941                 return -EINVAL;
5942
5943         if (flags != 0) {
5944                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
5945                 if (err < 0)
5946                         return err;
5947         }
5948
5949         if (set->flags & NFT_SET_MAP) {
5950                 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
5951                     !(flags & NFT_SET_ELEM_INTERVAL_END))
5952                         return -EINVAL;
5953         } else {
5954                 if (nla[NFTA_SET_ELEM_DATA] != NULL)
5955                         return -EINVAL;
5956         }
5957
5958         if (set->flags & NFT_SET_OBJECT) {
5959                 if (!nla[NFTA_SET_ELEM_OBJREF] &&
5960                     !(flags & NFT_SET_ELEM_INTERVAL_END))
5961                         return -EINVAL;
5962         } else {
5963                 if (nla[NFTA_SET_ELEM_OBJREF])
5964                         return -EINVAL;
5965         }
5966
5967         if (!nft_setelem_valid_key_end(set, nla, flags))
5968                 return -EINVAL;
5969
5970         if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
5971              (nla[NFTA_SET_ELEM_DATA] ||
5972               nla[NFTA_SET_ELEM_OBJREF] ||
5973               nla[NFTA_SET_ELEM_TIMEOUT] ||
5974               nla[NFTA_SET_ELEM_EXPIRATION] ||
5975               nla[NFTA_SET_ELEM_USERDATA] ||
5976               nla[NFTA_SET_ELEM_EXPR] ||
5977               nla[NFTA_SET_ELEM_KEY_END] ||
5978               nla[NFTA_SET_ELEM_EXPRESSIONS]))
5979                 return -EINVAL;
5980
5981         timeout = 0;
5982         if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
5983                 if (!(set->flags & NFT_SET_TIMEOUT))
5984                         return -EINVAL;
5985                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
5986                                             &timeout);
5987                 if (err)
5988                         return err;
5989         } else if (set->flags & NFT_SET_TIMEOUT &&
5990                    !(flags & NFT_SET_ELEM_INTERVAL_END)) {
5991                 timeout = set->timeout;
5992         }
5993
5994         expiration = 0;
5995         if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
5996                 if (!(set->flags & NFT_SET_TIMEOUT))
5997                         return -EINVAL;
5998                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
5999                                             &expiration);
6000                 if (err)
6001                         return err;
6002         }
6003
6004         if (nla[NFTA_SET_ELEM_EXPR]) {
6005                 struct nft_expr *expr;
6006
6007                 if (set->num_exprs && set->num_exprs != 1)
6008                         return -EOPNOTSUPP;
6009
6010                 expr = nft_set_elem_expr_alloc(ctx, set,
6011                                                nla[NFTA_SET_ELEM_EXPR]);
6012                 if (IS_ERR(expr))
6013                         return PTR_ERR(expr);
6014
6015                 expr_array[0] = expr;
6016                 num_exprs = 1;
6017
6018                 if (set->num_exprs && set->exprs[0]->ops != expr->ops) {
6019                         err = -EOPNOTSUPP;
6020                         goto err_set_elem_expr;
6021                 }
6022         } else if (nla[NFTA_SET_ELEM_EXPRESSIONS]) {
6023                 struct nft_expr *expr;
6024                 struct nlattr *tmp;
6025                 int left;
6026
6027                 i = 0;
6028                 nla_for_each_nested(tmp, nla[NFTA_SET_ELEM_EXPRESSIONS], left) {
6029                         if (i == NFT_SET_EXPR_MAX ||
6030                             (set->num_exprs && set->num_exprs == i)) {
6031                                 err = -E2BIG;
6032                                 goto err_set_elem_expr;
6033                         }
6034                         if (nla_type(tmp) != NFTA_LIST_ELEM) {
6035                                 err = -EINVAL;
6036                                 goto err_set_elem_expr;
6037                         }
6038                         expr = nft_set_elem_expr_alloc(ctx, set, tmp);
6039                         if (IS_ERR(expr)) {
6040                                 err = PTR_ERR(expr);
6041                                 goto err_set_elem_expr;
6042                         }
6043                         expr_array[i] = expr;
6044                         num_exprs++;
6045
6046                         if (set->num_exprs && expr->ops != set->exprs[i]->ops) {
6047                                 err = -EOPNOTSUPP;
6048                                 goto err_set_elem_expr;
6049                         }
6050                         i++;
6051                 }
6052                 if (set->num_exprs && set->num_exprs != i) {
6053                         err = -EOPNOTSUPP;
6054                         goto err_set_elem_expr;
6055                 }
6056         } else if (set->num_exprs > 0 &&
6057                    !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6058                 err = nft_set_elem_expr_clone(ctx, set, expr_array);
6059                 if (err < 0)
6060                         goto err_set_elem_expr_clone;
6061
6062                 num_exprs = set->num_exprs;
6063         }
6064
6065         if (nla[NFTA_SET_ELEM_KEY]) {
6066                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6067                                             nla[NFTA_SET_ELEM_KEY]);
6068                 if (err < 0)
6069                         goto err_set_elem_expr;
6070
6071                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6072                 if (err < 0)
6073                         goto err_parse_key;
6074         }
6075
6076         if (nla[NFTA_SET_ELEM_KEY_END]) {
6077                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6078                                             nla[NFTA_SET_ELEM_KEY_END]);
6079                 if (err < 0)
6080                         goto err_parse_key;
6081
6082                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6083                 if (err < 0)
6084                         goto err_parse_key_end;
6085         }
6086
6087         if (timeout > 0) {
6088                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
6089                 if (err < 0)
6090                         goto err_parse_key_end;
6091
6092                 if (timeout != set->timeout) {
6093                         err = nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
6094                         if (err < 0)
6095                                 goto err_parse_key_end;
6096                 }
6097         }
6098
6099         if (num_exprs) {
6100                 for (i = 0; i < num_exprs; i++)
6101                         size += expr_array[i]->ops->size;
6102
6103                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPRESSIONS,
6104                                              sizeof(struct nft_set_elem_expr) + size);
6105                 if (err < 0)
6106                         goto err_parse_key_end;
6107         }
6108
6109         if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
6110                 obj = nft_obj_lookup(ctx->net, ctx->table,
6111                                      nla[NFTA_SET_ELEM_OBJREF],
6112                                      set->objtype, genmask);
6113                 if (IS_ERR(obj)) {
6114                         err = PTR_ERR(obj);
6115                         goto err_parse_key_end;
6116                 }
6117                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
6118                 if (err < 0)
6119                         goto err_parse_key_end;
6120         }
6121
6122         if (nla[NFTA_SET_ELEM_DATA] != NULL) {
6123                 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
6124                                              nla[NFTA_SET_ELEM_DATA]);
6125                 if (err < 0)
6126                         goto err_parse_key_end;
6127
6128                 dreg = nft_type_to_reg(set->dtype);
6129                 list_for_each_entry(binding, &set->bindings, list) {
6130                         struct nft_ctx bind_ctx = {
6131                                 .net    = ctx->net,
6132                                 .family = ctx->family,
6133                                 .table  = ctx->table,
6134                                 .chain  = (struct nft_chain *)binding->chain,
6135                         };
6136
6137                         if (!(binding->flags & NFT_SET_MAP))
6138                                 continue;
6139
6140                         err = nft_validate_register_store(&bind_ctx, dreg,
6141                                                           &elem.data.val,
6142                                                           desc.type, desc.len);
6143                         if (err < 0)
6144                                 goto err_parse_data;
6145
6146                         if (desc.type == NFT_DATA_VERDICT &&
6147                             (elem.data.val.verdict.code == NFT_GOTO ||
6148                              elem.data.val.verdict.code == NFT_JUMP))
6149                                 nft_validate_state_update(ctx->net,
6150                                                           NFT_VALIDATE_NEED);
6151                 }
6152
6153                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
6154                 if (err < 0)
6155                         goto err_parse_data;
6156         }
6157
6158         /* The full maximum length of userdata can exceed the maximum
6159          * offset value (U8_MAX) for following extensions, therefor it
6160          * must be the last extension added.
6161          */
6162         ulen = 0;
6163         if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
6164                 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
6165                 if (ulen > 0) {
6166                         err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
6167                                                      ulen);
6168                         if (err < 0)
6169                                 goto err_parse_data;
6170                 }
6171         }
6172
6173         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6174                                       elem.key_end.val.data, elem.data.val.data,
6175                                       timeout, expiration, GFP_KERNEL_ACCOUNT);
6176         if (IS_ERR(elem.priv)) {
6177                 err = PTR_ERR(elem.priv);
6178                 goto err_parse_data;
6179         }
6180
6181         ext = nft_set_elem_ext(set, elem.priv);
6182         if (flags)
6183                 *nft_set_ext_flags(ext) = flags;
6184
6185         if (ulen > 0) {
6186                 if (nft_set_ext_check(&tmpl, NFT_SET_EXT_USERDATA, ulen) < 0) {
6187                         err = -EINVAL;
6188                         goto err_elem_userdata;
6189                 }
6190                 udata = nft_set_ext_userdata(ext);
6191                 udata->len = ulen - 1;
6192                 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
6193         }
6194         if (obj) {
6195                 *nft_set_ext_obj(ext) = obj;
6196                 obj->use++;
6197         }
6198         err = nft_set_elem_expr_setup(ctx, &tmpl, ext, expr_array, num_exprs);
6199         if (err < 0)
6200                 goto err_elem_free;
6201
6202         trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
6203         if (trans == NULL) {
6204                 err = -ENOMEM;
6205                 goto err_elem_free;
6206         }
6207
6208         ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
6209
6210         err = nft_setelem_insert(ctx->net, set, &elem, &ext2, flags);
6211         if (err) {
6212                 if (err == -EEXIST) {
6213                         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
6214                             nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
6215                             nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
6216                             nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
6217                                 goto err_element_clash;
6218                         if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
6219                              nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
6220                              memcmp(nft_set_ext_data(ext),
6221                                     nft_set_ext_data(ext2), set->dlen) != 0) ||
6222                             (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
6223                              nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
6224                              *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
6225                                 goto err_element_clash;
6226                         else if (!(nlmsg_flags & NLM_F_EXCL))
6227                                 err = 0;
6228                 } else if (err == -ENOTEMPTY) {
6229                         /* ENOTEMPTY reports overlapping between this element
6230                          * and an existing one.
6231                          */
6232                         err = -EEXIST;
6233                 }
6234                 goto err_element_clash;
6235         }
6236
6237         if (!(flags & NFT_SET_ELEM_CATCHALL) && set->size &&
6238             !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
6239                 err = -ENFILE;
6240                 goto err_set_full;
6241         }
6242
6243         nft_trans_elem(trans) = elem;
6244         nft_trans_commit_list_add_tail(ctx->net, trans);
6245         return 0;
6246
6247 err_set_full:
6248         nft_setelem_remove(ctx->net, set, &elem);
6249 err_element_clash:
6250         kfree(trans);
6251 err_elem_free:
6252         if (obj)
6253                 obj->use--;
6254 err_elem_userdata:
6255         nf_tables_set_elem_destroy(ctx, set, elem.priv);
6256 err_parse_data:
6257         if (nla[NFTA_SET_ELEM_DATA] != NULL)
6258                 nft_data_release(&elem.data.val, desc.type);
6259 err_parse_key_end:
6260         nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
6261 err_parse_key:
6262         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
6263 err_set_elem_expr:
6264         for (i = 0; i < num_exprs && expr_array[i]; i++)
6265                 nft_expr_destroy(ctx, expr_array[i]);
6266 err_set_elem_expr_clone:
6267         return err;
6268 }
6269
6270 static int nf_tables_newsetelem(struct sk_buff *skb,
6271                                 const struct nfnl_info *info,
6272                                 const struct nlattr * const nla[])
6273 {
6274         struct nftables_pernet *nft_net = nft_pernet(info->net);
6275         struct netlink_ext_ack *extack = info->extack;
6276         u8 genmask = nft_genmask_next(info->net);
6277         u8 family = info->nfmsg->nfgen_family;
6278         struct net *net = info->net;
6279         const struct nlattr *attr;
6280         struct nft_table *table;
6281         struct nft_set *set;
6282         struct nft_ctx ctx;
6283         int rem, err;
6284
6285         if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
6286                 return -EINVAL;
6287
6288         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6289                                  genmask, NETLINK_CB(skb).portid);
6290         if (IS_ERR(table)) {
6291                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6292                 return PTR_ERR(table);
6293         }
6294
6295         set = nft_set_lookup_global(net, table, nla[NFTA_SET_ELEM_LIST_SET],
6296                                     nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
6297         if (IS_ERR(set))
6298                 return PTR_ERR(set);
6299
6300         if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
6301                 return -EBUSY;
6302
6303         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6304
6305         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6306                 err = nft_add_set_elem(&ctx, set, attr, info->nlh->nlmsg_flags);
6307                 if (err < 0) {
6308                         NL_SET_BAD_ATTR(extack, attr);
6309                         return err;
6310                 }
6311         }
6312
6313         if (nft_net->validate_state == NFT_VALIDATE_DO)
6314                 return nft_table_validate(net, table);
6315
6316         return 0;
6317 }
6318
6319 /**
6320  *      nft_data_hold - hold a nft_data item
6321  *
6322  *      @data: struct nft_data to release
6323  *      @type: type of data
6324  *
6325  *      Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
6326  *      NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
6327  *      NFT_GOTO verdicts. This function must be called on active data objects
6328  *      from the second phase of the commit protocol.
6329  */
6330 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
6331 {
6332         struct nft_chain *chain;
6333         struct nft_rule *rule;
6334
6335         if (type == NFT_DATA_VERDICT) {
6336                 switch (data->verdict.code) {
6337                 case NFT_JUMP:
6338                 case NFT_GOTO:
6339                         chain = data->verdict.chain;
6340                         chain->use++;
6341
6342                         if (!nft_chain_is_bound(chain))
6343                                 break;
6344
6345                         chain->table->use++;
6346                         list_for_each_entry(rule, &chain->rules, list)
6347                                 chain->use++;
6348
6349                         nft_chain_add(chain->table, chain);
6350                         break;
6351                 }
6352         }
6353 }
6354
6355 static void nft_setelem_data_activate(const struct net *net,
6356                                       const struct nft_set *set,
6357                                       struct nft_set_elem *elem)
6358 {
6359         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6360
6361         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6362                 nft_data_hold(nft_set_ext_data(ext), set->dtype);
6363         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6364                 (*nft_set_ext_obj(ext))->use++;
6365 }
6366
6367 static void nft_setelem_data_deactivate(const struct net *net,
6368                                         const struct nft_set *set,
6369                                         struct nft_set_elem *elem)
6370 {
6371         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6372
6373         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6374                 nft_data_release(nft_set_ext_data(ext), set->dtype);
6375         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6376                 (*nft_set_ext_obj(ext))->use--;
6377 }
6378
6379 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
6380                            const struct nlattr *attr)
6381 {
6382         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6383         struct nft_set_ext_tmpl tmpl;
6384         struct nft_set_elem elem;
6385         struct nft_set_ext *ext;
6386         struct nft_trans *trans;
6387         u32 flags = 0;
6388         int err;
6389
6390         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6391                                           nft_set_elem_policy, NULL);
6392         if (err < 0)
6393                 return err;
6394
6395         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6396         if (err < 0)
6397                 return err;
6398
6399         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
6400                 return -EINVAL;
6401
6402         if (!nft_setelem_valid_key_end(set, nla, flags))
6403                 return -EINVAL;
6404
6405         nft_set_ext_prepare(&tmpl);
6406
6407         if (flags != 0) {
6408                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6409                 if (err < 0)
6410                         return err;
6411         }
6412
6413         if (nla[NFTA_SET_ELEM_KEY]) {
6414                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6415                                             nla[NFTA_SET_ELEM_KEY]);
6416                 if (err < 0)
6417                         return err;
6418
6419                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6420                 if (err < 0)
6421                         goto fail_elem;
6422         }
6423
6424         if (nla[NFTA_SET_ELEM_KEY_END]) {
6425                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6426                                             nla[NFTA_SET_ELEM_KEY_END]);
6427                 if (err < 0)
6428                         goto fail_elem;
6429
6430                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6431                 if (err < 0)
6432                         goto fail_elem_key_end;
6433         }
6434
6435         err = -ENOMEM;
6436         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6437                                       elem.key_end.val.data, NULL, 0, 0,
6438                                       GFP_KERNEL_ACCOUNT);
6439         if (IS_ERR(elem.priv)) {
6440                 err = PTR_ERR(elem.priv);
6441                 goto fail_elem_key_end;
6442         }
6443
6444         ext = nft_set_elem_ext(set, elem.priv);
6445         if (flags)
6446                 *nft_set_ext_flags(ext) = flags;
6447
6448         trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
6449         if (trans == NULL)
6450                 goto fail_trans;
6451
6452         err = nft_setelem_deactivate(ctx->net, set, &elem, flags);
6453         if (err < 0)
6454                 goto fail_ops;
6455
6456         nft_setelem_data_deactivate(ctx->net, set, &elem);
6457
6458         nft_trans_elem(trans) = elem;
6459         nft_trans_commit_list_add_tail(ctx->net, trans);
6460         return 0;
6461
6462 fail_ops:
6463         kfree(trans);
6464 fail_trans:
6465         kfree(elem.priv);
6466 fail_elem_key_end:
6467         nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
6468 fail_elem:
6469         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
6470         return err;
6471 }
6472
6473 static int nft_setelem_flush(const struct nft_ctx *ctx,
6474                              struct nft_set *set,
6475                              const struct nft_set_iter *iter,
6476                              struct nft_set_elem *elem)
6477 {
6478         struct nft_trans *trans;
6479         int err;
6480
6481         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
6482                                     sizeof(struct nft_trans_elem), GFP_ATOMIC);
6483         if (!trans)
6484                 return -ENOMEM;
6485
6486         if (!set->ops->flush(ctx->net, set, elem->priv)) {
6487                 err = -ENOENT;
6488                 goto err1;
6489         }
6490         set->ndeact++;
6491
6492         nft_setelem_data_deactivate(ctx->net, set, elem);
6493         nft_trans_elem_set(trans) = set;
6494         nft_trans_elem(trans) = *elem;
6495         nft_trans_commit_list_add_tail(ctx->net, trans);
6496
6497         return 0;
6498 err1:
6499         kfree(trans);
6500         return err;
6501 }
6502
6503 static int __nft_set_catchall_flush(const struct nft_ctx *ctx,
6504                                     struct nft_set *set,
6505                                     struct nft_set_elem *elem)
6506 {
6507         struct nft_trans *trans;
6508
6509         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
6510                                     sizeof(struct nft_trans_elem), GFP_KERNEL);
6511         if (!trans)
6512                 return -ENOMEM;
6513
6514         nft_setelem_data_deactivate(ctx->net, set, elem);
6515         nft_trans_elem_set(trans) = set;
6516         nft_trans_elem(trans) = *elem;
6517         nft_trans_commit_list_add_tail(ctx->net, trans);
6518
6519         return 0;
6520 }
6521
6522 static int nft_set_catchall_flush(const struct nft_ctx *ctx,
6523                                   struct nft_set *set)
6524 {
6525         u8 genmask = nft_genmask_next(ctx->net);
6526         struct nft_set_elem_catchall *catchall;
6527         struct nft_set_elem elem;
6528         struct nft_set_ext *ext;
6529         int ret = 0;
6530
6531         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
6532                 ext = nft_set_elem_ext(set, catchall->elem);
6533                 if (!nft_set_elem_active(ext, genmask) ||
6534                     nft_set_elem_mark_busy(ext))
6535                         continue;
6536
6537                 elem.priv = catchall->elem;
6538                 ret = __nft_set_catchall_flush(ctx, set, &elem);
6539                 if (ret < 0)
6540                         break;
6541         }
6542
6543         return ret;
6544 }
6545
6546 static int nft_set_flush(struct nft_ctx *ctx, struct nft_set *set, u8 genmask)
6547 {
6548         struct nft_set_iter iter = {
6549                 .genmask        = genmask,
6550                 .fn             = nft_setelem_flush,
6551         };
6552
6553         set->ops->walk(ctx, set, &iter);
6554         if (!iter.err)
6555                 iter.err = nft_set_catchall_flush(ctx, set);
6556
6557         return iter.err;
6558 }
6559
6560 static int nf_tables_delsetelem(struct sk_buff *skb,
6561                                 const struct nfnl_info *info,
6562                                 const struct nlattr * const nla[])
6563 {
6564         struct netlink_ext_ack *extack = info->extack;
6565         u8 genmask = nft_genmask_next(info->net);
6566         u8 family = info->nfmsg->nfgen_family;
6567         struct net *net = info->net;
6568         const struct nlattr *attr;
6569         struct nft_table *table;
6570         struct nft_set *set;
6571         struct nft_ctx ctx;
6572         int rem, err = 0;
6573
6574         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6575                                  genmask, NETLINK_CB(skb).portid);
6576         if (IS_ERR(table)) {
6577                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6578                 return PTR_ERR(table);
6579         }
6580
6581         set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
6582         if (IS_ERR(set))
6583                 return PTR_ERR(set);
6584         if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
6585                 return -EBUSY;
6586
6587         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6588
6589         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
6590                 return nft_set_flush(&ctx, set, genmask);
6591
6592         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6593                 err = nft_del_setelem(&ctx, set, attr);
6594                 if (err < 0) {
6595                         NL_SET_BAD_ATTR(extack, attr);
6596                         break;
6597                 }
6598         }
6599         return err;
6600 }
6601
6602 void nft_set_gc_batch_release(struct rcu_head *rcu)
6603 {
6604         struct nft_set_gc_batch *gcb;
6605         unsigned int i;
6606
6607         gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
6608         for (i = 0; i < gcb->head.cnt; i++)
6609                 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
6610         kfree(gcb);
6611 }
6612
6613 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
6614                                                 gfp_t gfp)
6615 {
6616         struct nft_set_gc_batch *gcb;
6617
6618         gcb = kzalloc(sizeof(*gcb), gfp);
6619         if (gcb == NULL)
6620                 return gcb;
6621         gcb->head.set = set;
6622         return gcb;
6623 }
6624
6625 /*
6626  * Stateful objects
6627  */
6628
6629 /**
6630  *      nft_register_obj- register nf_tables stateful object type
6631  *      @obj_type: object type
6632  *
6633  *      Registers the object type for use with nf_tables. Returns zero on
6634  *      success or a negative errno code otherwise.
6635  */
6636 int nft_register_obj(struct nft_object_type *obj_type)
6637 {
6638         if (obj_type->type == NFT_OBJECT_UNSPEC)
6639                 return -EINVAL;
6640
6641         nfnl_lock(NFNL_SUBSYS_NFTABLES);
6642         list_add_rcu(&obj_type->list, &nf_tables_objects);
6643         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6644         return 0;
6645 }
6646 EXPORT_SYMBOL_GPL(nft_register_obj);
6647
6648 /**
6649  *      nft_unregister_obj - unregister nf_tables object type
6650  *      @obj_type: object type
6651  *
6652  *      Unregisters the object type for use with nf_tables.
6653  */
6654 void nft_unregister_obj(struct nft_object_type *obj_type)
6655 {
6656         nfnl_lock(NFNL_SUBSYS_NFTABLES);
6657         list_del_rcu(&obj_type->list);
6658         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6659 }
6660 EXPORT_SYMBOL_GPL(nft_unregister_obj);
6661
6662 struct nft_object *nft_obj_lookup(const struct net *net,
6663                                   const struct nft_table *table,
6664                                   const struct nlattr *nla, u32 objtype,
6665                                   u8 genmask)
6666 {
6667         struct nft_object_hash_key k = { .table = table };
6668         char search[NFT_OBJ_MAXNAMELEN];
6669         struct rhlist_head *tmp, *list;
6670         struct nft_object *obj;
6671
6672         nla_strscpy(search, nla, sizeof(search));
6673         k.name = search;
6674
6675         WARN_ON_ONCE(!rcu_read_lock_held() &&
6676                      !lockdep_commit_lock_is_held(net));
6677
6678         rcu_read_lock();
6679         list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
6680         if (!list)
6681                 goto out;
6682
6683         rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
6684                 if (objtype == obj->ops->type->type &&
6685                     nft_active_genmask(obj, genmask)) {
6686                         rcu_read_unlock();
6687                         return obj;
6688                 }
6689         }
6690 out:
6691         rcu_read_unlock();
6692         return ERR_PTR(-ENOENT);
6693 }
6694 EXPORT_SYMBOL_GPL(nft_obj_lookup);
6695
6696 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
6697                                                   const struct nlattr *nla,
6698                                                   u32 objtype, u8 genmask)
6699 {
6700         struct nft_object *obj;
6701
6702         list_for_each_entry(obj, &table->objects, list) {
6703                 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
6704                     objtype == obj->ops->type->type &&
6705                     nft_active_genmask(obj, genmask))
6706                         return obj;
6707         }
6708         return ERR_PTR(-ENOENT);
6709 }
6710
6711 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
6712         [NFTA_OBJ_TABLE]        = { .type = NLA_STRING,
6713                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
6714         [NFTA_OBJ_NAME]         = { .type = NLA_STRING,
6715                                     .len = NFT_OBJ_MAXNAMELEN - 1 },
6716         [NFTA_OBJ_TYPE]         = { .type = NLA_U32 },
6717         [NFTA_OBJ_DATA]         = { .type = NLA_NESTED },
6718         [NFTA_OBJ_HANDLE]       = { .type = NLA_U64},
6719         [NFTA_OBJ_USERDATA]     = { .type = NLA_BINARY,
6720                                     .len = NFT_USERDATA_MAXLEN },
6721 };
6722
6723 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
6724                                        const struct nft_object_type *type,
6725                                        const struct nlattr *attr)
6726 {
6727         struct nlattr **tb;
6728         const struct nft_object_ops *ops;
6729         struct nft_object *obj;
6730         int err = -ENOMEM;
6731
6732         tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
6733         if (!tb)
6734                 goto err1;
6735
6736         if (attr) {
6737                 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
6738                                                   type->policy, NULL);
6739                 if (err < 0)
6740                         goto err2;
6741         } else {
6742                 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
6743         }
6744
6745         if (type->select_ops) {
6746                 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
6747                 if (IS_ERR(ops)) {
6748                         err = PTR_ERR(ops);
6749                         goto err2;
6750                 }
6751         } else {
6752                 ops = type->ops;
6753         }
6754
6755         err = -ENOMEM;
6756         obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL_ACCOUNT);
6757         if (!obj)
6758                 goto err2;
6759
6760         err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
6761         if (err < 0)
6762                 goto err3;
6763
6764         obj->ops = ops;
6765
6766         kfree(tb);
6767         return obj;
6768 err3:
6769         kfree(obj);
6770 err2:
6771         kfree(tb);
6772 err1:
6773         return ERR_PTR(err);
6774 }
6775
6776 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
6777                            struct nft_object *obj, bool reset)
6778 {
6779         struct nlattr *nest;
6780
6781         nest = nla_nest_start_noflag(skb, attr);
6782         if (!nest)
6783                 goto nla_put_failure;
6784         if (obj->ops->dump(skb, obj, reset) < 0)
6785                 goto nla_put_failure;
6786         nla_nest_end(skb, nest);
6787         return 0;
6788
6789 nla_put_failure:
6790         return -1;
6791 }
6792
6793 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
6794 {
6795         const struct nft_object_type *type;
6796
6797         list_for_each_entry(type, &nf_tables_objects, list) {
6798                 if (objtype == type->type)
6799                         return type;
6800         }
6801         return NULL;
6802 }
6803
6804 static const struct nft_object_type *
6805 nft_obj_type_get(struct net *net, u32 objtype)
6806 {
6807         const struct nft_object_type *type;
6808
6809         type = __nft_obj_type_get(objtype);
6810         if (type != NULL && try_module_get(type->owner))
6811                 return type;
6812
6813         lockdep_nfnl_nft_mutex_not_held();
6814 #ifdef CONFIG_MODULES
6815         if (type == NULL) {
6816                 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
6817                         return ERR_PTR(-EAGAIN);
6818         }
6819 #endif
6820         return ERR_PTR(-ENOENT);
6821 }
6822
6823 static int nf_tables_updobj(const struct nft_ctx *ctx,
6824                             const struct nft_object_type *type,
6825                             const struct nlattr *attr,
6826                             struct nft_object *obj)
6827 {
6828         struct nft_object *newobj;
6829         struct nft_trans *trans;
6830         int err = -ENOMEM;
6831
6832         if (!try_module_get(type->owner))
6833                 return -ENOENT;
6834
6835         trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
6836                                 sizeof(struct nft_trans_obj));
6837         if (!trans)
6838                 goto err_trans;
6839
6840         newobj = nft_obj_init(ctx, type, attr);
6841         if (IS_ERR(newobj)) {
6842                 err = PTR_ERR(newobj);
6843                 goto err_free_trans;
6844         }
6845
6846         nft_trans_obj(trans) = obj;
6847         nft_trans_obj_update(trans) = true;
6848         nft_trans_obj_newobj(trans) = newobj;
6849         nft_trans_commit_list_add_tail(ctx->net, trans);
6850
6851         return 0;
6852
6853 err_free_trans:
6854         kfree(trans);
6855 err_trans:
6856         module_put(type->owner);
6857         return err;
6858 }
6859
6860 static int nf_tables_newobj(struct sk_buff *skb, const struct nfnl_info *info,
6861                             const struct nlattr * const nla[])
6862 {
6863         struct netlink_ext_ack *extack = info->extack;
6864         u8 genmask = nft_genmask_next(info->net);
6865         u8 family = info->nfmsg->nfgen_family;
6866         const struct nft_object_type *type;
6867         struct net *net = info->net;
6868         struct nft_table *table;
6869         struct nft_object *obj;
6870         struct nft_ctx ctx;
6871         u32 objtype;
6872         int err;
6873
6874         if (!nla[NFTA_OBJ_TYPE] ||
6875             !nla[NFTA_OBJ_NAME] ||
6876             !nla[NFTA_OBJ_DATA])
6877                 return -EINVAL;
6878
6879         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
6880                                  NETLINK_CB(skb).portid);
6881         if (IS_ERR(table)) {
6882                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
6883                 return PTR_ERR(table);
6884         }
6885
6886         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6887         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
6888         if (IS_ERR(obj)) {
6889                 err = PTR_ERR(obj);
6890                 if (err != -ENOENT) {
6891                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6892                         return err;
6893                 }
6894         } else {
6895                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
6896                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6897                         return -EEXIST;
6898                 }
6899                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
6900                         return -EOPNOTSUPP;
6901
6902                 type = __nft_obj_type_get(objtype);
6903                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6904
6905                 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
6906         }
6907
6908         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6909
6910         type = nft_obj_type_get(net, objtype);
6911         if (IS_ERR(type))
6912                 return PTR_ERR(type);
6913
6914         obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
6915         if (IS_ERR(obj)) {
6916                 err = PTR_ERR(obj);
6917                 goto err_init;
6918         }
6919         obj->key.table = table;
6920         obj->handle = nf_tables_alloc_handle(table);
6921
6922         obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL_ACCOUNT);
6923         if (!obj->key.name) {
6924                 err = -ENOMEM;
6925                 goto err_strdup;
6926         }
6927
6928         if (nla[NFTA_OBJ_USERDATA]) {
6929                 obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL);
6930                 if (obj->udata == NULL)
6931                         goto err_userdata;
6932
6933                 obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]);
6934         }
6935
6936         err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
6937         if (err < 0)
6938                 goto err_trans;
6939
6940         err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
6941                               nft_objname_ht_params);
6942         if (err < 0)
6943                 goto err_obj_ht;
6944
6945         list_add_tail_rcu(&obj->list, &table->objects);
6946         table->use++;
6947         return 0;
6948 err_obj_ht:
6949         /* queued in transaction log */
6950         INIT_LIST_HEAD(&obj->list);
6951         return err;
6952 err_trans:
6953         kfree(obj->udata);
6954 err_userdata:
6955         kfree(obj->key.name);
6956 err_strdup:
6957         if (obj->ops->destroy)
6958                 obj->ops->destroy(&ctx, obj);
6959         kfree(obj);
6960 err_init:
6961         module_put(type->owner);
6962         return err;
6963 }
6964
6965 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
6966                                    u32 portid, u32 seq, int event, u32 flags,
6967                                    int family, const struct nft_table *table,
6968                                    struct nft_object *obj, bool reset)
6969 {
6970         struct nlmsghdr *nlh;
6971
6972         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
6973         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
6974                            NFNETLINK_V0, nft_base_seq(net));
6975         if (!nlh)
6976                 goto nla_put_failure;
6977
6978         if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
6979             nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
6980             nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
6981             nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
6982             nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset) ||
6983             nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
6984                          NFTA_OBJ_PAD))
6985                 goto nla_put_failure;
6986
6987         if (obj->udata &&
6988             nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata))
6989                 goto nla_put_failure;
6990
6991         nlmsg_end(skb, nlh);
6992         return 0;
6993
6994 nla_put_failure:
6995         nlmsg_trim(skb, nlh);
6996         return -1;
6997 }
6998
6999 struct nft_obj_filter {
7000         char            *table;
7001         u32             type;
7002 };
7003
7004 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
7005 {
7006         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
7007         const struct nft_table *table;
7008         unsigned int idx = 0, s_idx = cb->args[0];
7009         struct nft_obj_filter *filter = cb->data;
7010         struct net *net = sock_net(skb->sk);
7011         int family = nfmsg->nfgen_family;
7012         struct nftables_pernet *nft_net;
7013         struct nft_object *obj;
7014         bool reset = false;
7015
7016         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7017                 reset = true;
7018
7019         rcu_read_lock();
7020         nft_net = nft_pernet(net);
7021         cb->seq = READ_ONCE(nft_net->base_seq);
7022
7023         list_for_each_entry_rcu(table, &nft_net->tables, list) {
7024                 if (family != NFPROTO_UNSPEC && family != table->family)
7025                         continue;
7026
7027                 list_for_each_entry_rcu(obj, &table->objects, list) {
7028                         if (!nft_is_active(net, obj))
7029                                 goto cont;
7030                         if (idx < s_idx)
7031                                 goto cont;
7032                         if (idx > s_idx)
7033                                 memset(&cb->args[1], 0,
7034                                        sizeof(cb->args) - sizeof(cb->args[0]));
7035                         if (filter && filter->table &&
7036                             strcmp(filter->table, table->name))
7037                                 goto cont;
7038                         if (filter &&
7039                             filter->type != NFT_OBJECT_UNSPEC &&
7040                             obj->ops->type->type != filter->type)
7041                                 goto cont;
7042                         if (reset) {
7043                                 char *buf = kasprintf(GFP_ATOMIC,
7044                                                       "%s:%u",
7045                                                       table->name,
7046                                                       nft_net->base_seq);
7047
7048                                 audit_log_nfcfg(buf,
7049                                                 family,
7050                                                 obj->handle,
7051                                                 AUDIT_NFT_OP_OBJ_RESET,
7052                                                 GFP_ATOMIC);
7053                                 kfree(buf);
7054                         }
7055
7056                         if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
7057                                                     cb->nlh->nlmsg_seq,
7058                                                     NFT_MSG_NEWOBJ,
7059                                                     NLM_F_MULTI | NLM_F_APPEND,
7060                                                     table->family, table,
7061                                                     obj, reset) < 0)
7062                                 goto done;
7063
7064                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7065 cont:
7066                         idx++;
7067                 }
7068         }
7069 done:
7070         rcu_read_unlock();
7071
7072         cb->args[0] = idx;
7073         return skb->len;
7074 }
7075
7076 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
7077 {
7078         const struct nlattr * const *nla = cb->data;
7079         struct nft_obj_filter *filter = NULL;
7080
7081         if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
7082                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
7083                 if (!filter)
7084                         return -ENOMEM;
7085
7086                 if (nla[NFTA_OBJ_TABLE]) {
7087                         filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
7088                         if (!filter->table) {
7089                                 kfree(filter);
7090                                 return -ENOMEM;
7091                         }
7092                 }
7093
7094                 if (nla[NFTA_OBJ_TYPE])
7095                         filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7096         }
7097
7098         cb->data = filter;
7099         return 0;
7100 }
7101
7102 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
7103 {
7104         struct nft_obj_filter *filter = cb->data;
7105
7106         if (filter) {
7107                 kfree(filter->table);
7108                 kfree(filter);
7109         }
7110
7111         return 0;
7112 }
7113
7114 /* called with rcu_read_lock held */
7115 static int nf_tables_getobj(struct sk_buff *skb, const struct nfnl_info *info,
7116                             const struct nlattr * const nla[])
7117 {
7118         struct netlink_ext_ack *extack = info->extack;
7119         u8 genmask = nft_genmask_cur(info->net);
7120         u8 family = info->nfmsg->nfgen_family;
7121         const struct nft_table *table;
7122         struct net *net = info->net;
7123         struct nft_object *obj;
7124         struct sk_buff *skb2;
7125         bool reset = false;
7126         u32 objtype;
7127         int err;
7128
7129         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
7130                 struct netlink_dump_control c = {
7131                         .start = nf_tables_dump_obj_start,
7132                         .dump = nf_tables_dump_obj,
7133                         .done = nf_tables_dump_obj_done,
7134                         .module = THIS_MODULE,
7135                         .data = (void *)nla,
7136                 };
7137
7138                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
7139         }
7140
7141         if (!nla[NFTA_OBJ_NAME] ||
7142             !nla[NFTA_OBJ_TYPE])
7143                 return -EINVAL;
7144
7145         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 0);
7146         if (IS_ERR(table)) {
7147                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7148                 return PTR_ERR(table);
7149         }
7150
7151         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7152         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7153         if (IS_ERR(obj)) {
7154                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7155                 return PTR_ERR(obj);
7156         }
7157
7158         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7159         if (!skb2)
7160                 return -ENOMEM;
7161
7162         if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7163                 reset = true;
7164
7165         if (reset) {
7166                 const struct nftables_pernet *nft_net;
7167                 char *buf;
7168
7169                 nft_net = nft_pernet(net);
7170                 buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, nft_net->base_seq);
7171
7172                 audit_log_nfcfg(buf,
7173                                 family,
7174                                 obj->handle,
7175                                 AUDIT_NFT_OP_OBJ_RESET,
7176                                 GFP_ATOMIC);
7177                 kfree(buf);
7178         }
7179
7180         err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
7181                                       info->nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
7182                                       family, table, obj, reset);
7183         if (err < 0)
7184                 goto err_fill_obj_info;
7185
7186         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7187
7188 err_fill_obj_info:
7189         kfree_skb(skb2);
7190         return err;
7191 }
7192
7193 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
7194 {
7195         if (obj->ops->destroy)
7196                 obj->ops->destroy(ctx, obj);
7197
7198         module_put(obj->ops->type->owner);
7199         kfree(obj->key.name);
7200         kfree(obj->udata);
7201         kfree(obj);
7202 }
7203
7204 static int nf_tables_delobj(struct sk_buff *skb, const struct nfnl_info *info,
7205                             const struct nlattr * const nla[])
7206 {
7207         struct netlink_ext_ack *extack = info->extack;
7208         u8 genmask = nft_genmask_next(info->net);
7209         u8 family = info->nfmsg->nfgen_family;
7210         struct net *net = info->net;
7211         const struct nlattr *attr;
7212         struct nft_table *table;
7213         struct nft_object *obj;
7214         struct nft_ctx ctx;
7215         u32 objtype;
7216
7217         if (!nla[NFTA_OBJ_TYPE] ||
7218             (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
7219                 return -EINVAL;
7220
7221         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7222                                  NETLINK_CB(skb).portid);
7223         if (IS_ERR(table)) {
7224                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7225                 return PTR_ERR(table);
7226         }
7227
7228         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7229         if (nla[NFTA_OBJ_HANDLE]) {
7230                 attr = nla[NFTA_OBJ_HANDLE];
7231                 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
7232         } else {
7233                 attr = nla[NFTA_OBJ_NAME];
7234                 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
7235         }
7236
7237         if (IS_ERR(obj)) {
7238                 NL_SET_BAD_ATTR(extack, attr);
7239                 return PTR_ERR(obj);
7240         }
7241         if (obj->use > 0) {
7242                 NL_SET_BAD_ATTR(extack, attr);
7243                 return -EBUSY;
7244         }
7245
7246         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7247
7248         return nft_delobj(&ctx, obj);
7249 }
7250
7251 void nft_obj_notify(struct net *net, const struct nft_table *table,
7252                     struct nft_object *obj, u32 portid, u32 seq, int event,
7253                     u16 flags, int family, int report, gfp_t gfp)
7254 {
7255         struct nftables_pernet *nft_net = nft_pernet(net);
7256         struct sk_buff *skb;
7257         int err;
7258         char *buf = kasprintf(gfp, "%s:%u",
7259                               table->name, nft_net->base_seq);
7260
7261         audit_log_nfcfg(buf,
7262                         family,
7263                         obj->handle,
7264                         event == NFT_MSG_NEWOBJ ?
7265                                  AUDIT_NFT_OP_OBJ_REGISTER :
7266                                  AUDIT_NFT_OP_OBJ_UNREGISTER,
7267                         gfp);
7268         kfree(buf);
7269
7270         if (!report &&
7271             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
7272                 return;
7273
7274         skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
7275         if (skb == NULL)
7276                 goto err;
7277
7278         err = nf_tables_fill_obj_info(skb, net, portid, seq, event,
7279                                       flags & (NLM_F_CREATE | NLM_F_EXCL),
7280                                       family, table, obj, false);
7281         if (err < 0) {
7282                 kfree_skb(skb);
7283                 goto err;
7284         }
7285
7286         nft_notify_enqueue(skb, report, &nft_net->notify_list);
7287         return;
7288 err:
7289         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
7290 }
7291 EXPORT_SYMBOL_GPL(nft_obj_notify);
7292
7293 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
7294                                  struct nft_object *obj, int event)
7295 {
7296         nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
7297                        ctx->flags, ctx->family, ctx->report, GFP_KERNEL);
7298 }
7299
7300 /*
7301  * Flow tables
7302  */
7303 void nft_register_flowtable_type(struct nf_flowtable_type *type)
7304 {
7305         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7306         list_add_tail_rcu(&type->list, &nf_tables_flowtables);
7307         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7308 }
7309 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
7310
7311 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
7312 {
7313         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7314         list_del_rcu(&type->list);
7315         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7316 }
7317 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
7318
7319 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
7320         [NFTA_FLOWTABLE_TABLE]          = { .type = NLA_STRING,
7321                                             .len = NFT_NAME_MAXLEN - 1 },
7322         [NFTA_FLOWTABLE_NAME]           = { .type = NLA_STRING,
7323                                             .len = NFT_NAME_MAXLEN - 1 },
7324         [NFTA_FLOWTABLE_HOOK]           = { .type = NLA_NESTED },
7325         [NFTA_FLOWTABLE_HANDLE]         = { .type = NLA_U64 },
7326         [NFTA_FLOWTABLE_FLAGS]          = { .type = NLA_U32 },
7327 };
7328
7329 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
7330                                            const struct nlattr *nla, u8 genmask)
7331 {
7332         struct nft_flowtable *flowtable;
7333
7334         list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
7335                 if (!nla_strcmp(nla, flowtable->name) &&
7336                     nft_active_genmask(flowtable, genmask))
7337                         return flowtable;
7338         }
7339         return ERR_PTR(-ENOENT);
7340 }
7341 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
7342
7343 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
7344                                     struct nft_flowtable *flowtable,
7345                                     enum nft_trans_phase phase)
7346 {
7347         switch (phase) {
7348         case NFT_TRANS_PREPARE:
7349         case NFT_TRANS_ABORT:
7350         case NFT_TRANS_RELEASE:
7351                 flowtable->use--;
7352                 fallthrough;
7353         default:
7354                 return;
7355         }
7356 }
7357 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
7358
7359 static struct nft_flowtable *
7360 nft_flowtable_lookup_byhandle(const struct nft_table *table,
7361                               const struct nlattr *nla, u8 genmask)
7362 {
7363        struct nft_flowtable *flowtable;
7364
7365        list_for_each_entry(flowtable, &table->flowtables, list) {
7366                if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
7367                    nft_active_genmask(flowtable, genmask))
7368                        return flowtable;
7369        }
7370        return ERR_PTR(-ENOENT);
7371 }
7372
7373 struct nft_flowtable_hook {
7374         u32                     num;
7375         int                     priority;
7376         struct list_head        list;
7377 };
7378
7379 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
7380         [NFTA_FLOWTABLE_HOOK_NUM]       = { .type = NLA_U32 },
7381         [NFTA_FLOWTABLE_HOOK_PRIORITY]  = { .type = NLA_U32 },
7382         [NFTA_FLOWTABLE_HOOK_DEVS]      = { .type = NLA_NESTED },
7383 };
7384
7385 static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
7386                                     const struct nlattr *attr,
7387                                     struct nft_flowtable_hook *flowtable_hook,
7388                                     struct nft_flowtable *flowtable, bool add)
7389 {
7390         struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
7391         struct nft_hook *hook;
7392         int hooknum, priority;
7393         int err;
7394
7395         INIT_LIST_HEAD(&flowtable_hook->list);
7396
7397         err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX, attr,
7398                                           nft_flowtable_hook_policy, NULL);
7399         if (err < 0)
7400                 return err;
7401
7402         if (add) {
7403                 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
7404                     !tb[NFTA_FLOWTABLE_HOOK_PRIORITY])
7405                         return -EINVAL;
7406
7407                 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
7408                 if (hooknum != NF_NETDEV_INGRESS)
7409                         return -EOPNOTSUPP;
7410
7411                 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
7412
7413                 flowtable_hook->priority        = priority;
7414                 flowtable_hook->num             = hooknum;
7415         } else {
7416                 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
7417                         hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
7418                         if (hooknum != flowtable->hooknum)
7419                                 return -EOPNOTSUPP;
7420                 }
7421
7422                 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
7423                         priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
7424                         if (priority != flowtable->data.priority)
7425                                 return -EOPNOTSUPP;
7426                 }
7427
7428                 flowtable_hook->priority        = flowtable->data.priority;
7429                 flowtable_hook->num             = flowtable->hooknum;
7430         }
7431
7432         if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
7433                 err = nf_tables_parse_netdev_hooks(ctx->net,
7434                                                    tb[NFTA_FLOWTABLE_HOOK_DEVS],
7435                                                    &flowtable_hook->list);
7436                 if (err < 0)
7437                         return err;
7438         }
7439
7440         list_for_each_entry(hook, &flowtable_hook->list, list) {
7441                 hook->ops.pf            = NFPROTO_NETDEV;
7442                 hook->ops.hooknum       = flowtable_hook->num;
7443                 hook->ops.priority      = flowtable_hook->priority;
7444                 hook->ops.priv          = &flowtable->data;
7445                 hook->ops.hook          = flowtable->data.type->hook;
7446         }
7447
7448         return err;
7449 }
7450
7451 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
7452 {
7453         const struct nf_flowtable_type *type;
7454
7455         list_for_each_entry(type, &nf_tables_flowtables, list) {
7456                 if (family == type->family)
7457                         return type;
7458         }
7459         return NULL;
7460 }
7461
7462 static const struct nf_flowtable_type *
7463 nft_flowtable_type_get(struct net *net, u8 family)
7464 {
7465         const struct nf_flowtable_type *type;
7466
7467         type = __nft_flowtable_type_get(family);
7468         if (type != NULL && try_module_get(type->owner))
7469                 return type;
7470
7471         lockdep_nfnl_nft_mutex_not_held();
7472 #ifdef CONFIG_MODULES
7473         if (type == NULL) {
7474                 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
7475                         return ERR_PTR(-EAGAIN);
7476         }
7477 #endif
7478         return ERR_PTR(-ENOENT);
7479 }
7480
7481 /* Only called from error and netdev event paths. */
7482 static void nft_unregister_flowtable_hook(struct net *net,
7483                                           struct nft_flowtable *flowtable,
7484                                           struct nft_hook *hook)
7485 {
7486         nf_unregister_net_hook(net, &hook->ops);
7487         flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
7488                                     FLOW_BLOCK_UNBIND);
7489 }
7490
7491 static void __nft_unregister_flowtable_net_hooks(struct net *net,
7492                                                  struct list_head *hook_list,
7493                                                  bool release_netdev)
7494 {
7495         struct nft_hook *hook, *next;
7496
7497         list_for_each_entry_safe(hook, next, hook_list, list) {
7498                 nf_unregister_net_hook(net, &hook->ops);
7499                 if (release_netdev) {
7500                         list_del(&hook->list);
7501                         kfree_rcu(hook, rcu);
7502                 }
7503         }
7504 }
7505
7506 static void nft_unregister_flowtable_net_hooks(struct net *net,
7507                                                struct list_head *hook_list)
7508 {
7509         __nft_unregister_flowtable_net_hooks(net, hook_list, false);
7510 }
7511
7512 static int nft_register_flowtable_net_hooks(struct net *net,
7513                                             struct nft_table *table,
7514                                             struct list_head *hook_list,
7515                                             struct nft_flowtable *flowtable)
7516 {
7517         struct nft_hook *hook, *hook2, *next;
7518         struct nft_flowtable *ft;
7519         int err, i = 0;
7520
7521         list_for_each_entry(hook, hook_list, list) {
7522                 list_for_each_entry(ft, &table->flowtables, list) {
7523                         if (!nft_is_active_next(net, ft))
7524                                 continue;
7525
7526                         list_for_each_entry(hook2, &ft->hook_list, list) {
7527                                 if (hook->ops.dev == hook2->ops.dev &&
7528                                     hook->ops.pf == hook2->ops.pf) {
7529                                         err = -EEXIST;
7530                                         goto err_unregister_net_hooks;
7531                                 }
7532                         }
7533                 }
7534
7535                 err = flowtable->data.type->setup(&flowtable->data,
7536                                                   hook->ops.dev,
7537                                                   FLOW_BLOCK_BIND);
7538                 if (err < 0)
7539                         goto err_unregister_net_hooks;
7540
7541                 err = nf_register_net_hook(net, &hook->ops);
7542                 if (err < 0) {
7543                         flowtable->data.type->setup(&flowtable->data,
7544                                                     hook->ops.dev,
7545                                                     FLOW_BLOCK_UNBIND);
7546                         goto err_unregister_net_hooks;
7547                 }
7548
7549                 i++;
7550         }
7551
7552         return 0;
7553
7554 err_unregister_net_hooks:
7555         list_for_each_entry_safe(hook, next, hook_list, list) {
7556                 if (i-- <= 0)
7557                         break;
7558
7559                 nft_unregister_flowtable_hook(net, flowtable, hook);
7560                 list_del_rcu(&hook->list);
7561                 kfree_rcu(hook, rcu);
7562         }
7563
7564         return err;
7565 }
7566
7567 static void nft_flowtable_hooks_destroy(struct list_head *hook_list)
7568 {
7569         struct nft_hook *hook, *next;
7570
7571         list_for_each_entry_safe(hook, next, hook_list, list) {
7572                 list_del_rcu(&hook->list);
7573                 kfree_rcu(hook, rcu);
7574         }
7575 }
7576
7577 static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
7578                                 struct nft_flowtable *flowtable)
7579 {
7580         const struct nlattr * const *nla = ctx->nla;
7581         struct nft_flowtable_hook flowtable_hook;
7582         struct nft_hook *hook, *next;
7583         struct nft_trans *trans;
7584         bool unregister = false;
7585         u32 flags;
7586         int err;
7587
7588         err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
7589                                        &flowtable_hook, flowtable, false);
7590         if (err < 0)
7591                 return err;
7592
7593         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
7594                 if (nft_hook_list_find(&flowtable->hook_list, hook)) {
7595                         list_del(&hook->list);
7596                         kfree(hook);
7597                 }
7598         }
7599
7600         if (nla[NFTA_FLOWTABLE_FLAGS]) {
7601                 flags = ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
7602                 if (flags & ~NFT_FLOWTABLE_MASK) {
7603                         err = -EOPNOTSUPP;
7604                         goto err_flowtable_update_hook;
7605                 }
7606                 if ((flowtable->data.flags & NFT_FLOWTABLE_HW_OFFLOAD) ^
7607                     (flags & NFT_FLOWTABLE_HW_OFFLOAD)) {
7608                         err = -EOPNOTSUPP;
7609                         goto err_flowtable_update_hook;
7610                 }
7611         } else {
7612                 flags = flowtable->data.flags;
7613         }
7614
7615         err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
7616                                                &flowtable_hook.list, flowtable);
7617         if (err < 0)
7618                 goto err_flowtable_update_hook;
7619
7620         trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
7621                                 sizeof(struct nft_trans_flowtable));
7622         if (!trans) {
7623                 unregister = true;
7624                 err = -ENOMEM;
7625                 goto err_flowtable_update_hook;
7626         }
7627
7628         nft_trans_flowtable_flags(trans) = flags;
7629         nft_trans_flowtable(trans) = flowtable;
7630         nft_trans_flowtable_update(trans) = true;
7631         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
7632         list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
7633
7634         nft_trans_commit_list_add_tail(ctx->net, trans);
7635
7636         return 0;
7637
7638 err_flowtable_update_hook:
7639         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
7640                 if (unregister)
7641                         nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
7642                 list_del_rcu(&hook->list);
7643                 kfree_rcu(hook, rcu);
7644         }
7645
7646         return err;
7647
7648 }
7649
7650 static int nf_tables_newflowtable(struct sk_buff *skb,
7651                                   const struct nfnl_info *info,
7652                                   const struct nlattr * const nla[])
7653 {
7654         struct netlink_ext_ack *extack = info->extack;
7655         struct nft_flowtable_hook flowtable_hook;
7656         u8 genmask = nft_genmask_next(info->net);
7657         u8 family = info->nfmsg->nfgen_family;
7658         const struct nf_flowtable_type *type;
7659         struct nft_flowtable *flowtable;
7660         struct nft_hook *hook, *next;
7661         struct net *net = info->net;
7662         struct nft_table *table;
7663         struct nft_ctx ctx;
7664         int err;
7665
7666         if (!nla[NFTA_FLOWTABLE_TABLE] ||
7667             !nla[NFTA_FLOWTABLE_NAME] ||
7668             !nla[NFTA_FLOWTABLE_HOOK])
7669                 return -EINVAL;
7670
7671         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7672                                  genmask, NETLINK_CB(skb).portid);
7673         if (IS_ERR(table)) {
7674                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
7675                 return PTR_ERR(table);
7676         }
7677
7678         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
7679                                          genmask);
7680         if (IS_ERR(flowtable)) {
7681                 err = PTR_ERR(flowtable);
7682                 if (err != -ENOENT) {
7683                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
7684                         return err;
7685                 }
7686         } else {
7687                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
7688                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
7689                         return -EEXIST;
7690                 }
7691
7692                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7693
7694                 return nft_flowtable_update(&ctx, info->nlh, flowtable);
7695         }
7696
7697         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7698
7699         flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL_ACCOUNT);
7700         if (!flowtable)
7701                 return -ENOMEM;
7702
7703         flowtable->table = table;
7704         flowtable->handle = nf_tables_alloc_handle(table);
7705         INIT_LIST_HEAD(&flowtable->hook_list);
7706
7707         flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL_ACCOUNT);
7708         if (!flowtable->name) {
7709                 err = -ENOMEM;
7710                 goto err1;
7711         }
7712
7713         type = nft_flowtable_type_get(net, family);
7714         if (IS_ERR(type)) {
7715                 err = PTR_ERR(type);
7716                 goto err2;
7717         }
7718
7719         if (nla[NFTA_FLOWTABLE_FLAGS]) {
7720                 flowtable->data.flags =
7721                         ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
7722                 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK) {
7723                         err = -EOPNOTSUPP;
7724                         goto err3;
7725                 }
7726         }
7727
7728         write_pnet(&flowtable->data.net, net);
7729         flowtable->data.type = type;
7730         err = type->init(&flowtable->data);
7731         if (err < 0)
7732                 goto err3;
7733
7734         err = nft_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK],
7735                                        &flowtable_hook, flowtable, true);
7736         if (err < 0)
7737                 goto err4;
7738
7739         list_splice(&flowtable_hook.list, &flowtable->hook_list);
7740         flowtable->data.priority = flowtable_hook.priority;
7741         flowtable->hooknum = flowtable_hook.num;
7742
7743         err = nft_register_flowtable_net_hooks(ctx.net, table,
7744                                                &flowtable->hook_list,
7745                                                flowtable);
7746         if (err < 0) {
7747                 nft_flowtable_hooks_destroy(&flowtable->hook_list);
7748                 goto err4;
7749         }
7750
7751         err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
7752         if (err < 0)
7753                 goto err5;
7754
7755         list_add_tail_rcu(&flowtable->list, &table->flowtables);
7756         table->use++;
7757
7758         return 0;
7759 err5:
7760         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
7761                 nft_unregister_flowtable_hook(net, flowtable, hook);
7762                 list_del_rcu(&hook->list);
7763                 kfree_rcu(hook, rcu);
7764         }
7765 err4:
7766         flowtable->data.type->free(&flowtable->data);
7767 err3:
7768         module_put(type->owner);
7769 err2:
7770         kfree(flowtable->name);
7771 err1:
7772         kfree(flowtable);
7773         return err;
7774 }
7775
7776 static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
7777 {
7778         struct nft_hook *this, *next;
7779
7780         list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
7781                 list_del(&this->list);
7782                 kfree(this);
7783         }
7784 }
7785
7786 static int nft_delflowtable_hook(struct nft_ctx *ctx,
7787                                  struct nft_flowtable *flowtable)
7788 {
7789         const struct nlattr * const *nla = ctx->nla;
7790         struct nft_flowtable_hook flowtable_hook;
7791         LIST_HEAD(flowtable_del_list);
7792         struct nft_hook *this, *hook;
7793         struct nft_trans *trans;
7794         int err;
7795
7796         err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
7797                                        &flowtable_hook, flowtable, false);
7798         if (err < 0)
7799                 return err;
7800
7801         list_for_each_entry(this, &flowtable_hook.list, list) {
7802                 hook = nft_hook_list_find(&flowtable->hook_list, this);
7803                 if (!hook) {
7804                         err = -ENOENT;
7805                         goto err_flowtable_del_hook;
7806                 }
7807                 list_move(&hook->list, &flowtable_del_list);
7808         }
7809
7810         trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
7811                                 sizeof(struct nft_trans_flowtable));
7812         if (!trans) {
7813                 err = -ENOMEM;
7814                 goto err_flowtable_del_hook;
7815         }
7816
7817         nft_trans_flowtable(trans) = flowtable;
7818         nft_trans_flowtable_update(trans) = true;
7819         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
7820         list_splice(&flowtable_del_list, &nft_trans_flowtable_hooks(trans));
7821         nft_flowtable_hook_release(&flowtable_hook);
7822
7823         nft_trans_commit_list_add_tail(ctx->net, trans);
7824
7825         return 0;
7826
7827 err_flowtable_del_hook:
7828         list_splice(&flowtable_del_list, &flowtable->hook_list);
7829         nft_flowtable_hook_release(&flowtable_hook);
7830
7831         return err;
7832 }
7833
7834 static int nf_tables_delflowtable(struct sk_buff *skb,
7835                                   const struct nfnl_info *info,
7836                                   const struct nlattr * const nla[])
7837 {
7838         struct netlink_ext_ack *extack = info->extack;
7839         u8 genmask = nft_genmask_next(info->net);
7840         u8 family = info->nfmsg->nfgen_family;
7841         struct nft_flowtable *flowtable;
7842         struct net *net = info->net;
7843         const struct nlattr *attr;
7844         struct nft_table *table;
7845         struct nft_ctx ctx;
7846
7847         if (!nla[NFTA_FLOWTABLE_TABLE] ||
7848             (!nla[NFTA_FLOWTABLE_NAME] &&
7849              !nla[NFTA_FLOWTABLE_HANDLE]))
7850                 return -EINVAL;
7851
7852         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7853                                  genmask, NETLINK_CB(skb).portid);
7854         if (IS_ERR(table)) {
7855                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
7856                 return PTR_ERR(table);
7857         }
7858
7859         if (nla[NFTA_FLOWTABLE_HANDLE]) {
7860                 attr = nla[NFTA_FLOWTABLE_HANDLE];
7861                 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
7862         } else {
7863                 attr = nla[NFTA_FLOWTABLE_NAME];
7864                 flowtable = nft_flowtable_lookup(table, attr, genmask);
7865         }
7866
7867         if (IS_ERR(flowtable)) {
7868                 NL_SET_BAD_ATTR(extack, attr);
7869                 return PTR_ERR(flowtable);
7870         }
7871
7872         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7873
7874         if (nla[NFTA_FLOWTABLE_HOOK])
7875                 return nft_delflowtable_hook(&ctx, flowtable);
7876
7877         if (flowtable->use > 0) {
7878                 NL_SET_BAD_ATTR(extack, attr);
7879                 return -EBUSY;
7880         }
7881
7882         return nft_delflowtable(&ctx, flowtable);
7883 }
7884
7885 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
7886                                          u32 portid, u32 seq, int event,
7887                                          u32 flags, int family,
7888                                          struct nft_flowtable *flowtable,
7889                                          struct list_head *hook_list)
7890 {
7891         struct nlattr *nest, *nest_devs;
7892         struct nft_hook *hook;
7893         struct nlmsghdr *nlh;
7894
7895         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
7896         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
7897                            NFNETLINK_V0, nft_base_seq(net));
7898         if (!nlh)
7899                 goto nla_put_failure;
7900
7901         if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
7902             nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
7903             nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
7904             nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
7905                          NFTA_FLOWTABLE_PAD) ||
7906             nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
7907                 goto nla_put_failure;
7908
7909         nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
7910         if (!nest)
7911                 goto nla_put_failure;
7912         if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
7913             nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
7914                 goto nla_put_failure;
7915
7916         nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
7917         if (!nest_devs)
7918                 goto nla_put_failure;
7919
7920         list_for_each_entry_rcu(hook, hook_list, list) {
7921                 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
7922                         goto nla_put_failure;
7923         }
7924         nla_nest_end(skb, nest_devs);
7925         nla_nest_end(skb, nest);
7926
7927         nlmsg_end(skb, nlh);
7928         return 0;
7929
7930 nla_put_failure:
7931         nlmsg_trim(skb, nlh);
7932         return -1;
7933 }
7934
7935 struct nft_flowtable_filter {
7936         char            *table;
7937 };
7938
7939 static int nf_tables_dump_flowtable(struct sk_buff *skb,
7940                                     struct netlink_callback *cb)
7941 {
7942         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
7943         struct nft_flowtable_filter *filter = cb->data;
7944         unsigned int idx = 0, s_idx = cb->args[0];
7945         struct net *net = sock_net(skb->sk);
7946         int family = nfmsg->nfgen_family;
7947         struct nft_flowtable *flowtable;
7948         struct nftables_pernet *nft_net;
7949         const struct nft_table *table;
7950
7951         rcu_read_lock();
7952         nft_net = nft_pernet(net);
7953         cb->seq = READ_ONCE(nft_net->base_seq);
7954
7955         list_for_each_entry_rcu(table, &nft_net->tables, list) {
7956                 if (family != NFPROTO_UNSPEC && family != table->family)
7957                         continue;
7958
7959                 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
7960                         if (!nft_is_active(net, flowtable))
7961                                 goto cont;
7962                         if (idx < s_idx)
7963                                 goto cont;
7964                         if (idx > s_idx)
7965                                 memset(&cb->args[1], 0,
7966                                        sizeof(cb->args) - sizeof(cb->args[0]));
7967                         if (filter && filter->table &&
7968                             strcmp(filter->table, table->name))
7969                                 goto cont;
7970
7971                         if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
7972                                                           cb->nlh->nlmsg_seq,
7973                                                           NFT_MSG_NEWFLOWTABLE,
7974                                                           NLM_F_MULTI | NLM_F_APPEND,
7975                                                           table->family,
7976                                                           flowtable,
7977                                                           &flowtable->hook_list) < 0)
7978                                 goto done;
7979
7980                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7981 cont:
7982                         idx++;
7983                 }
7984         }
7985 done:
7986         rcu_read_unlock();
7987
7988         cb->args[0] = idx;
7989         return skb->len;
7990 }
7991
7992 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
7993 {
7994         const struct nlattr * const *nla = cb->data;
7995         struct nft_flowtable_filter *filter = NULL;
7996
7997         if (nla[NFTA_FLOWTABLE_TABLE]) {
7998                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
7999                 if (!filter)
8000                         return -ENOMEM;
8001
8002                 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
8003                                            GFP_ATOMIC);
8004                 if (!filter->table) {
8005                         kfree(filter);
8006                         return -ENOMEM;
8007                 }
8008         }
8009
8010         cb->data = filter;
8011         return 0;
8012 }
8013
8014 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
8015 {
8016         struct nft_flowtable_filter *filter = cb->data;
8017
8018         if (!filter)
8019                 return 0;
8020
8021         kfree(filter->table);
8022         kfree(filter);
8023
8024         return 0;
8025 }
8026
8027 /* called with rcu_read_lock held */
8028 static int nf_tables_getflowtable(struct sk_buff *skb,
8029                                   const struct nfnl_info *info,
8030                                   const struct nlattr * const nla[])
8031 {
8032         u8 genmask = nft_genmask_cur(info->net);
8033         u8 family = info->nfmsg->nfgen_family;
8034         struct nft_flowtable *flowtable;
8035         const struct nft_table *table;
8036         struct net *net = info->net;
8037         struct sk_buff *skb2;
8038         int err;
8039
8040         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
8041                 struct netlink_dump_control c = {
8042                         .start = nf_tables_dump_flowtable_start,
8043                         .dump = nf_tables_dump_flowtable,
8044                         .done = nf_tables_dump_flowtable_done,
8045                         .module = THIS_MODULE,
8046                         .data = (void *)nla,
8047                 };
8048
8049                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
8050         }
8051
8052         if (!nla[NFTA_FLOWTABLE_NAME])
8053                 return -EINVAL;
8054
8055         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8056                                  genmask, 0);
8057         if (IS_ERR(table))
8058                 return PTR_ERR(table);
8059
8060         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
8061                                          genmask);
8062         if (IS_ERR(flowtable))
8063                 return PTR_ERR(flowtable);
8064
8065         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8066         if (!skb2)
8067                 return -ENOMEM;
8068
8069         err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
8070                                             info->nlh->nlmsg_seq,
8071                                             NFT_MSG_NEWFLOWTABLE, 0, family,
8072                                             flowtable, &flowtable->hook_list);
8073         if (err < 0)
8074                 goto err_fill_flowtable_info;
8075
8076         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
8077
8078 err_fill_flowtable_info:
8079         kfree_skb(skb2);
8080         return err;
8081 }
8082
8083 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
8084                                        struct nft_flowtable *flowtable,
8085                                        struct list_head *hook_list,
8086                                        int event)
8087 {
8088         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
8089         struct sk_buff *skb;
8090         u16 flags = 0;
8091         int err;
8092
8093         if (!ctx->report &&
8094             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
8095                 return;
8096
8097         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8098         if (skb == NULL)
8099                 goto err;
8100
8101         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
8102                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
8103
8104         err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
8105                                             ctx->seq, event, flags,
8106                                             ctx->family, flowtable, hook_list);
8107         if (err < 0) {
8108                 kfree_skb(skb);
8109                 goto err;
8110         }
8111
8112         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
8113         return;
8114 err:
8115         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
8116 }
8117
8118 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
8119 {
8120         struct nft_hook *hook, *next;
8121
8122         flowtable->data.type->free(&flowtable->data);
8123         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
8124                 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
8125                                             FLOW_BLOCK_UNBIND);
8126                 list_del_rcu(&hook->list);
8127                 kfree(hook);
8128         }
8129         kfree(flowtable->name);
8130         module_put(flowtable->data.type->owner);
8131         kfree(flowtable);
8132 }
8133
8134 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
8135                                    u32 portid, u32 seq)
8136 {
8137         struct nftables_pernet *nft_net = nft_pernet(net);
8138         struct nlmsghdr *nlh;
8139         char buf[TASK_COMM_LEN];
8140         int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
8141
8142         nlh = nfnl_msg_put(skb, portid, seq, event, 0, AF_UNSPEC,
8143                            NFNETLINK_V0, nft_base_seq(net));
8144         if (!nlh)
8145                 goto nla_put_failure;
8146
8147         if (nla_put_be32(skb, NFTA_GEN_ID, htonl(nft_net->base_seq)) ||
8148             nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
8149             nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
8150                 goto nla_put_failure;
8151
8152         nlmsg_end(skb, nlh);
8153         return 0;
8154
8155 nla_put_failure:
8156         nlmsg_trim(skb, nlh);
8157         return -EMSGSIZE;
8158 }
8159
8160 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
8161                                 struct nft_flowtable *flowtable)
8162 {
8163         struct nft_hook *hook;
8164
8165         list_for_each_entry(hook, &flowtable->hook_list, list) {
8166                 if (hook->ops.dev != dev)
8167                         continue;
8168
8169                 /* flow_offload_netdev_event() cleans up entries for us. */
8170                 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
8171                 list_del_rcu(&hook->list);
8172                 kfree_rcu(hook, rcu);
8173                 break;
8174         }
8175 }
8176
8177 static int nf_tables_flowtable_event(struct notifier_block *this,
8178                                      unsigned long event, void *ptr)
8179 {
8180         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
8181         struct nft_flowtable *flowtable;
8182         struct nftables_pernet *nft_net;
8183         struct nft_table *table;
8184         struct net *net;
8185
8186         if (event != NETDEV_UNREGISTER)
8187                 return 0;
8188
8189         net = dev_net(dev);
8190         nft_net = nft_pernet(net);
8191         mutex_lock(&nft_net->commit_mutex);
8192         list_for_each_entry(table, &nft_net->tables, list) {
8193                 list_for_each_entry(flowtable, &table->flowtables, list) {
8194                         nft_flowtable_event(event, dev, flowtable);
8195                 }
8196         }
8197         mutex_unlock(&nft_net->commit_mutex);
8198
8199         return NOTIFY_DONE;
8200 }
8201
8202 static struct notifier_block nf_tables_flowtable_notifier = {
8203         .notifier_call  = nf_tables_flowtable_event,
8204 };
8205
8206 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
8207                                  int event)
8208 {
8209         struct nlmsghdr *nlh = nlmsg_hdr(skb);
8210         struct sk_buff *skb2;
8211         int err;
8212
8213         if (!nlmsg_report(nlh) &&
8214             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
8215                 return;
8216
8217         skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8218         if (skb2 == NULL)
8219                 goto err;
8220
8221         err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
8222                                       nlh->nlmsg_seq);
8223         if (err < 0) {
8224                 kfree_skb(skb2);
8225                 goto err;
8226         }
8227
8228         nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8229                        nlmsg_report(nlh), GFP_KERNEL);
8230         return;
8231 err:
8232         nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8233                           -ENOBUFS);
8234 }
8235
8236 static int nf_tables_getgen(struct sk_buff *skb, const struct nfnl_info *info,
8237                             const struct nlattr * const nla[])
8238 {
8239         struct sk_buff *skb2;
8240         int err;
8241
8242         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8243         if (skb2 == NULL)
8244                 return -ENOMEM;
8245
8246         err = nf_tables_fill_gen_info(skb2, info->net, NETLINK_CB(skb).portid,
8247                                       info->nlh->nlmsg_seq);
8248         if (err < 0)
8249                 goto err_fill_gen_info;
8250
8251         return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
8252
8253 err_fill_gen_info:
8254         kfree_skb(skb2);
8255         return err;
8256 }
8257
8258 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
8259         [NFT_MSG_NEWTABLE] = {
8260                 .call           = nf_tables_newtable,
8261                 .type           = NFNL_CB_BATCH,
8262                 .attr_count     = NFTA_TABLE_MAX,
8263                 .policy         = nft_table_policy,
8264         },
8265         [NFT_MSG_GETTABLE] = {
8266                 .call           = nf_tables_gettable,
8267                 .type           = NFNL_CB_RCU,
8268                 .attr_count     = NFTA_TABLE_MAX,
8269                 .policy         = nft_table_policy,
8270         },
8271         [NFT_MSG_DELTABLE] = {
8272                 .call           = nf_tables_deltable,
8273                 .type           = NFNL_CB_BATCH,
8274                 .attr_count     = NFTA_TABLE_MAX,
8275                 .policy         = nft_table_policy,
8276         },
8277         [NFT_MSG_NEWCHAIN] = {
8278                 .call           = nf_tables_newchain,
8279                 .type           = NFNL_CB_BATCH,
8280                 .attr_count     = NFTA_CHAIN_MAX,
8281                 .policy         = nft_chain_policy,
8282         },
8283         [NFT_MSG_GETCHAIN] = {
8284                 .call           = nf_tables_getchain,
8285                 .type           = NFNL_CB_RCU,
8286                 .attr_count     = NFTA_CHAIN_MAX,
8287                 .policy         = nft_chain_policy,
8288         },
8289         [NFT_MSG_DELCHAIN] = {
8290                 .call           = nf_tables_delchain,
8291                 .type           = NFNL_CB_BATCH,
8292                 .attr_count     = NFTA_CHAIN_MAX,
8293                 .policy         = nft_chain_policy,
8294         },
8295         [NFT_MSG_NEWRULE] = {
8296                 .call           = nf_tables_newrule,
8297                 .type           = NFNL_CB_BATCH,
8298                 .attr_count     = NFTA_RULE_MAX,
8299                 .policy         = nft_rule_policy,
8300         },
8301         [NFT_MSG_GETRULE] = {
8302                 .call           = nf_tables_getrule,
8303                 .type           = NFNL_CB_RCU,
8304                 .attr_count     = NFTA_RULE_MAX,
8305                 .policy         = nft_rule_policy,
8306         },
8307         [NFT_MSG_DELRULE] = {
8308                 .call           = nf_tables_delrule,
8309                 .type           = NFNL_CB_BATCH,
8310                 .attr_count     = NFTA_RULE_MAX,
8311                 .policy         = nft_rule_policy,
8312         },
8313         [NFT_MSG_NEWSET] = {
8314                 .call           = nf_tables_newset,
8315                 .type           = NFNL_CB_BATCH,
8316                 .attr_count     = NFTA_SET_MAX,
8317                 .policy         = nft_set_policy,
8318         },
8319         [NFT_MSG_GETSET] = {
8320                 .call           = nf_tables_getset,
8321                 .type           = NFNL_CB_RCU,
8322                 .attr_count     = NFTA_SET_MAX,
8323                 .policy         = nft_set_policy,
8324         },
8325         [NFT_MSG_DELSET] = {
8326                 .call           = nf_tables_delset,
8327                 .type           = NFNL_CB_BATCH,
8328                 .attr_count     = NFTA_SET_MAX,
8329                 .policy         = nft_set_policy,
8330         },
8331         [NFT_MSG_NEWSETELEM] = {
8332                 .call           = nf_tables_newsetelem,
8333                 .type           = NFNL_CB_BATCH,
8334                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
8335                 .policy         = nft_set_elem_list_policy,
8336         },
8337         [NFT_MSG_GETSETELEM] = {
8338                 .call           = nf_tables_getsetelem,
8339                 .type           = NFNL_CB_RCU,
8340                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
8341                 .policy         = nft_set_elem_list_policy,
8342         },
8343         [NFT_MSG_DELSETELEM] = {
8344                 .call           = nf_tables_delsetelem,
8345                 .type           = NFNL_CB_BATCH,
8346                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
8347                 .policy         = nft_set_elem_list_policy,
8348         },
8349         [NFT_MSG_GETGEN] = {
8350                 .call           = nf_tables_getgen,
8351                 .type           = NFNL_CB_RCU,
8352         },
8353         [NFT_MSG_NEWOBJ] = {
8354                 .call           = nf_tables_newobj,
8355                 .type           = NFNL_CB_BATCH,
8356                 .attr_count     = NFTA_OBJ_MAX,
8357                 .policy         = nft_obj_policy,
8358         },
8359         [NFT_MSG_GETOBJ] = {
8360                 .call           = nf_tables_getobj,
8361                 .type           = NFNL_CB_RCU,
8362                 .attr_count     = NFTA_OBJ_MAX,
8363                 .policy         = nft_obj_policy,
8364         },
8365         [NFT_MSG_DELOBJ] = {
8366                 .call           = nf_tables_delobj,
8367                 .type           = NFNL_CB_BATCH,
8368                 .attr_count     = NFTA_OBJ_MAX,
8369                 .policy         = nft_obj_policy,
8370         },
8371         [NFT_MSG_GETOBJ_RESET] = {
8372                 .call           = nf_tables_getobj,
8373                 .type           = NFNL_CB_RCU,
8374                 .attr_count     = NFTA_OBJ_MAX,
8375                 .policy         = nft_obj_policy,
8376         },
8377         [NFT_MSG_NEWFLOWTABLE] = {
8378                 .call           = nf_tables_newflowtable,
8379                 .type           = NFNL_CB_BATCH,
8380                 .attr_count     = NFTA_FLOWTABLE_MAX,
8381                 .policy         = nft_flowtable_policy,
8382         },
8383         [NFT_MSG_GETFLOWTABLE] = {
8384                 .call           = nf_tables_getflowtable,
8385                 .type           = NFNL_CB_RCU,
8386                 .attr_count     = NFTA_FLOWTABLE_MAX,
8387                 .policy         = nft_flowtable_policy,
8388         },
8389         [NFT_MSG_DELFLOWTABLE] = {
8390                 .call           = nf_tables_delflowtable,
8391                 .type           = NFNL_CB_BATCH,
8392                 .attr_count     = NFTA_FLOWTABLE_MAX,
8393                 .policy         = nft_flowtable_policy,
8394         },
8395 };
8396
8397 static int nf_tables_validate(struct net *net)
8398 {
8399         struct nftables_pernet *nft_net = nft_pernet(net);
8400         struct nft_table *table;
8401
8402         switch (nft_net->validate_state) {
8403         case NFT_VALIDATE_SKIP:
8404                 break;
8405         case NFT_VALIDATE_NEED:
8406                 nft_validate_state_update(net, NFT_VALIDATE_DO);
8407                 fallthrough;
8408         case NFT_VALIDATE_DO:
8409                 list_for_each_entry(table, &nft_net->tables, list) {
8410                         if (nft_table_validate(net, table) < 0)
8411                                 return -EAGAIN;
8412                 }
8413                 break;
8414         }
8415
8416         return 0;
8417 }
8418
8419 /* a drop policy has to be deferred until all rules have been activated,
8420  * otherwise a large ruleset that contains a drop-policy base chain will
8421  * cause all packets to get dropped until the full transaction has been
8422  * processed.
8423  *
8424  * We defer the drop policy until the transaction has been finalized.
8425  */
8426 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
8427 {
8428         struct nft_base_chain *basechain;
8429
8430         if (nft_trans_chain_policy(trans) != NF_DROP)
8431                 return;
8432
8433         if (!nft_is_base_chain(trans->ctx.chain))
8434                 return;
8435
8436         basechain = nft_base_chain(trans->ctx.chain);
8437         basechain->policy = NF_DROP;
8438 }
8439
8440 static void nft_chain_commit_update(struct nft_trans *trans)
8441 {
8442         struct nft_base_chain *basechain;
8443
8444         if (nft_trans_chain_name(trans)) {
8445                 rhltable_remove(&trans->ctx.table->chains_ht,
8446                                 &trans->ctx.chain->rhlhead,
8447                                 nft_chain_ht_params);
8448                 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
8449                 rhltable_insert_key(&trans->ctx.table->chains_ht,
8450                                     trans->ctx.chain->name,
8451                                     &trans->ctx.chain->rhlhead,
8452                                     nft_chain_ht_params);
8453         }
8454
8455         if (!nft_is_base_chain(trans->ctx.chain))
8456                 return;
8457
8458         nft_chain_stats_replace(trans);
8459
8460         basechain = nft_base_chain(trans->ctx.chain);
8461
8462         switch (nft_trans_chain_policy(trans)) {
8463         case NF_DROP:
8464         case NF_ACCEPT:
8465                 basechain->policy = nft_trans_chain_policy(trans);
8466                 break;
8467         }
8468 }
8469
8470 static void nft_obj_commit_update(struct nft_trans *trans)
8471 {
8472         struct nft_object *newobj;
8473         struct nft_object *obj;
8474
8475         obj = nft_trans_obj(trans);
8476         newobj = nft_trans_obj_newobj(trans);
8477
8478         if (obj->ops->update)
8479                 obj->ops->update(obj, newobj);
8480
8481         nft_obj_destroy(&trans->ctx, newobj);
8482 }
8483
8484 static void nft_commit_release(struct nft_trans *trans)
8485 {
8486         switch (trans->msg_type) {
8487         case NFT_MSG_DELTABLE:
8488                 nf_tables_table_destroy(&trans->ctx);
8489                 break;
8490         case NFT_MSG_NEWCHAIN:
8491                 free_percpu(nft_trans_chain_stats(trans));
8492                 kfree(nft_trans_chain_name(trans));
8493                 break;
8494         case NFT_MSG_DELCHAIN:
8495                 nf_tables_chain_destroy(&trans->ctx);
8496                 break;
8497         case NFT_MSG_DELRULE:
8498                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
8499                 break;
8500         case NFT_MSG_DELSET:
8501                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
8502                 break;
8503         case NFT_MSG_DELSETELEM:
8504                 nf_tables_set_elem_destroy(&trans->ctx,
8505                                            nft_trans_elem_set(trans),
8506                                            nft_trans_elem(trans).priv);
8507                 break;
8508         case NFT_MSG_DELOBJ:
8509                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
8510                 break;
8511         case NFT_MSG_DELFLOWTABLE:
8512                 if (nft_trans_flowtable_update(trans))
8513                         nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
8514                 else
8515                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
8516                 break;
8517         }
8518
8519         if (trans->put_net)
8520                 put_net(trans->ctx.net);
8521
8522         kfree(trans);
8523 }
8524
8525 static void nf_tables_trans_destroy_work(struct work_struct *w)
8526 {
8527         struct nft_trans *trans, *next;
8528         LIST_HEAD(head);
8529
8530         spin_lock(&nf_tables_destroy_list_lock);
8531         list_splice_init(&nf_tables_destroy_list, &head);
8532         spin_unlock(&nf_tables_destroy_list_lock);
8533
8534         if (list_empty(&head))
8535                 return;
8536
8537         synchronize_rcu();
8538
8539         list_for_each_entry_safe(trans, next, &head, list) {
8540                 list_del(&trans->list);
8541                 nft_commit_release(trans);
8542         }
8543 }
8544
8545 void nf_tables_trans_destroy_flush_work(void)
8546 {
8547         flush_work(&trans_destroy_work);
8548 }
8549 EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
8550
8551 static bool nft_expr_reduce(struct nft_regs_track *track,
8552                             const struct nft_expr *expr)
8553 {
8554         return false;
8555 }
8556
8557 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
8558 {
8559         const struct nft_expr *expr, *last;
8560         struct nft_regs_track track = {};
8561         unsigned int size, data_size;
8562         void *data, *data_boundary;
8563         struct nft_rule_dp *prule;
8564         struct nft_rule *rule;
8565
8566         /* already handled or inactive chain? */
8567         if (chain->blob_next || !nft_is_active_next(net, chain))
8568                 return 0;
8569
8570         data_size = 0;
8571         list_for_each_entry(rule, &chain->rules, list) {
8572                 if (nft_is_active_next(net, rule)) {
8573                         data_size += sizeof(*prule) + rule->dlen;
8574                         if (data_size > INT_MAX)
8575                                 return -ENOMEM;
8576                 }
8577         }
8578         data_size += offsetof(struct nft_rule_dp, data);        /* last rule */
8579
8580         chain->blob_next = nf_tables_chain_alloc_rules(data_size);
8581         if (!chain->blob_next)
8582                 return -ENOMEM;
8583
8584         data = (void *)chain->blob_next->data;
8585         data_boundary = data + data_size;
8586         size = 0;
8587
8588         list_for_each_entry(rule, &chain->rules, list) {
8589                 if (!nft_is_active_next(net, rule))
8590                         continue;
8591
8592                 prule = (struct nft_rule_dp *)data;
8593                 data += offsetof(struct nft_rule_dp, data);
8594                 if (WARN_ON_ONCE(data > data_boundary))
8595                         return -ENOMEM;
8596
8597                 size = 0;
8598                 track.last = nft_expr_last(rule);
8599                 nft_rule_for_each_expr(expr, last, rule) {
8600                         track.cur = expr;
8601
8602                         if (nft_expr_reduce(&track, expr)) {
8603                                 expr = track.cur;
8604                                 continue;
8605                         }
8606
8607                         if (WARN_ON_ONCE(data + expr->ops->size > data_boundary))
8608                                 return -ENOMEM;
8609
8610                         memcpy(data + size, expr, expr->ops->size);
8611                         size += expr->ops->size;
8612                 }
8613                 if (WARN_ON_ONCE(size >= 1 << 12))
8614                         return -ENOMEM;
8615
8616                 prule->handle = rule->handle;
8617                 prule->dlen = size;
8618                 prule->is_last = 0;
8619
8620                 data += size;
8621                 size = 0;
8622                 chain->blob_next->size += (unsigned long)(data - (void *)prule);
8623         }
8624
8625         prule = (struct nft_rule_dp *)data;
8626         data += offsetof(struct nft_rule_dp, data);
8627         if (WARN_ON_ONCE(data > data_boundary))
8628                 return -ENOMEM;
8629
8630         nft_last_rule(chain->blob_next, prule);
8631
8632         return 0;
8633 }
8634
8635 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
8636 {
8637         struct nftables_pernet *nft_net = nft_pernet(net);
8638         struct nft_trans *trans, *next;
8639
8640         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
8641                 struct nft_chain *chain = trans->ctx.chain;
8642
8643                 if (trans->msg_type == NFT_MSG_NEWRULE ||
8644                     trans->msg_type == NFT_MSG_DELRULE) {
8645                         kvfree(chain->blob_next);
8646                         chain->blob_next = NULL;
8647                 }
8648         }
8649 }
8650
8651 static void __nf_tables_commit_chain_free_rules_old(struct rcu_head *h)
8652 {
8653         struct nft_rules_old *o = container_of(h, struct nft_rules_old, h);
8654
8655         kvfree(o->blob);
8656 }
8657
8658 static void nf_tables_commit_chain_free_rules_old(struct nft_rule_blob *blob)
8659 {
8660         struct nft_rules_old *old;
8661
8662         /* rcu_head is after end marker */
8663         old = (void *)blob + sizeof(*blob) + blob->size;
8664         old->blob = blob;
8665
8666         call_rcu(&old->h, __nf_tables_commit_chain_free_rules_old);
8667 }
8668
8669 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
8670 {
8671         struct nft_rule_blob *g0, *g1;
8672         bool next_genbit;
8673
8674         next_genbit = nft_gencursor_next(net);
8675
8676         g0 = rcu_dereference_protected(chain->blob_gen_0,
8677                                        lockdep_commit_lock_is_held(net));
8678         g1 = rcu_dereference_protected(chain->blob_gen_1,
8679                                        lockdep_commit_lock_is_held(net));
8680
8681         /* No changes to this chain? */
8682         if (chain->blob_next == NULL) {
8683                 /* chain had no change in last or next generation */
8684                 if (g0 == g1)
8685                         return;
8686                 /*
8687                  * chain had no change in this generation; make sure next
8688                  * one uses same rules as current generation.
8689                  */
8690                 if (next_genbit) {
8691                         rcu_assign_pointer(chain->blob_gen_1, g0);
8692                         nf_tables_commit_chain_free_rules_old(g1);
8693                 } else {
8694                         rcu_assign_pointer(chain->blob_gen_0, g1);
8695                         nf_tables_commit_chain_free_rules_old(g0);
8696                 }
8697
8698                 return;
8699         }
8700
8701         if (next_genbit)
8702                 rcu_assign_pointer(chain->blob_gen_1, chain->blob_next);
8703         else
8704                 rcu_assign_pointer(chain->blob_gen_0, chain->blob_next);
8705
8706         chain->blob_next = NULL;
8707
8708         if (g0 == g1)
8709                 return;
8710
8711         if (next_genbit)
8712                 nf_tables_commit_chain_free_rules_old(g1);
8713         else
8714                 nf_tables_commit_chain_free_rules_old(g0);
8715 }
8716
8717 static void nft_obj_del(struct nft_object *obj)
8718 {
8719         rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
8720         list_del_rcu(&obj->list);
8721 }
8722
8723 void nft_chain_del(struct nft_chain *chain)
8724 {
8725         struct nft_table *table = chain->table;
8726
8727         WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
8728                                      nft_chain_ht_params));
8729         list_del_rcu(&chain->list);
8730 }
8731
8732 static void nf_tables_module_autoload_cleanup(struct net *net)
8733 {
8734         struct nftables_pernet *nft_net = nft_pernet(net);
8735         struct nft_module_request *req, *next;
8736
8737         WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
8738         list_for_each_entry_safe(req, next, &nft_net->module_list, list) {
8739                 WARN_ON_ONCE(!req->done);
8740                 list_del(&req->list);
8741                 kfree(req);
8742         }
8743 }
8744
8745 static void nf_tables_commit_release(struct net *net)
8746 {
8747         struct nftables_pernet *nft_net = nft_pernet(net);
8748         struct nft_trans *trans;
8749
8750         /* all side effects have to be made visible.
8751          * For example, if a chain named 'foo' has been deleted, a
8752          * new transaction must not find it anymore.
8753          *
8754          * Memory reclaim happens asynchronously from work queue
8755          * to prevent expensive synchronize_rcu() in commit phase.
8756          */
8757         if (list_empty(&nft_net->commit_list)) {
8758                 nf_tables_module_autoload_cleanup(net);
8759                 mutex_unlock(&nft_net->commit_mutex);
8760                 return;
8761         }
8762
8763         trans = list_last_entry(&nft_net->commit_list,
8764                                 struct nft_trans, list);
8765         get_net(trans->ctx.net);
8766         WARN_ON_ONCE(trans->put_net);
8767
8768         trans->put_net = true;
8769         spin_lock(&nf_tables_destroy_list_lock);
8770         list_splice_tail_init(&nft_net->commit_list, &nf_tables_destroy_list);
8771         spin_unlock(&nf_tables_destroy_list_lock);
8772
8773         nf_tables_module_autoload_cleanup(net);
8774         schedule_work(&trans_destroy_work);
8775
8776         mutex_unlock(&nft_net->commit_mutex);
8777 }
8778
8779 static void nft_commit_notify(struct net *net, u32 portid)
8780 {
8781         struct nftables_pernet *nft_net = nft_pernet(net);
8782         struct sk_buff *batch_skb = NULL, *nskb, *skb;
8783         unsigned char *data;
8784         int len;
8785
8786         list_for_each_entry_safe(skb, nskb, &nft_net->notify_list, list) {
8787                 if (!batch_skb) {
8788 new_batch:
8789                         batch_skb = skb;
8790                         len = NLMSG_GOODSIZE - skb->len;
8791                         list_del(&skb->list);
8792                         continue;
8793                 }
8794                 len -= skb->len;
8795                 if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) {
8796                         data = skb_put(batch_skb, skb->len);
8797                         memcpy(data, skb->data, skb->len);
8798                         list_del(&skb->list);
8799                         kfree_skb(skb);
8800                         continue;
8801                 }
8802                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
8803                                NFT_CB(batch_skb).report, GFP_KERNEL);
8804                 goto new_batch;
8805         }
8806
8807         if (batch_skb) {
8808                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
8809                                NFT_CB(batch_skb).report, GFP_KERNEL);
8810         }
8811
8812         WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
8813 }
8814
8815 static int nf_tables_commit_audit_alloc(struct list_head *adl,
8816                                         struct nft_table *table)
8817 {
8818         struct nft_audit_data *adp;
8819
8820         list_for_each_entry(adp, adl, list) {
8821                 if (adp->table == table)
8822                         return 0;
8823         }
8824         adp = kzalloc(sizeof(*adp), GFP_KERNEL);
8825         if (!adp)
8826                 return -ENOMEM;
8827         adp->table = table;
8828         list_add(&adp->list, adl);
8829         return 0;
8830 }
8831
8832 static void nf_tables_commit_audit_free(struct list_head *adl)
8833 {
8834         struct nft_audit_data *adp, *adn;
8835
8836         list_for_each_entry_safe(adp, adn, adl, list) {
8837                 list_del(&adp->list);
8838                 kfree(adp);
8839         }
8840 }
8841
8842 static void nf_tables_commit_audit_collect(struct list_head *adl,
8843                                            struct nft_table *table, u32 op)
8844 {
8845         struct nft_audit_data *adp;
8846
8847         list_for_each_entry(adp, adl, list) {
8848                 if (adp->table == table)
8849                         goto found;
8850         }
8851         WARN_ONCE(1, "table=%s not expected in commit list", table->name);
8852         return;
8853 found:
8854         adp->entries++;
8855         if (!adp->op || adp->op > op)
8856                 adp->op = op;
8857 }
8858
8859 #define AUNFTABLENAMELEN (NFT_TABLE_MAXNAMELEN + 22)
8860
8861 static void nf_tables_commit_audit_log(struct list_head *adl, u32 generation)
8862 {
8863         struct nft_audit_data *adp, *adn;
8864         char aubuf[AUNFTABLENAMELEN];
8865
8866         list_for_each_entry_safe(adp, adn, adl, list) {
8867                 snprintf(aubuf, AUNFTABLENAMELEN, "%s:%u", adp->table->name,
8868                          generation);
8869                 audit_log_nfcfg(aubuf, adp->table->family, adp->entries,
8870                                 nft2audit_op[adp->op], GFP_KERNEL);
8871                 list_del(&adp->list);
8872                 kfree(adp);
8873         }
8874 }
8875
8876 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
8877 {
8878         struct nftables_pernet *nft_net = nft_pernet(net);
8879         struct nft_trans *trans, *next;
8880         struct nft_trans_elem *te;
8881         struct nft_chain *chain;
8882         struct nft_table *table;
8883         unsigned int base_seq;
8884         LIST_HEAD(adl);
8885         int err;
8886
8887         if (list_empty(&nft_net->commit_list)) {
8888                 mutex_unlock(&nft_net->commit_mutex);
8889                 return 0;
8890         }
8891
8892         /* 0. Validate ruleset, otherwise roll back for error reporting. */
8893         if (nf_tables_validate(net) < 0)
8894                 return -EAGAIN;
8895
8896         err = nft_flow_rule_offload_commit(net);
8897         if (err < 0)
8898                 return err;
8899
8900         /* 1.  Allocate space for next generation rules_gen_X[] */
8901         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
8902                 int ret;
8903
8904                 ret = nf_tables_commit_audit_alloc(&adl, trans->ctx.table);
8905                 if (ret) {
8906                         nf_tables_commit_chain_prepare_cancel(net);
8907                         nf_tables_commit_audit_free(&adl);
8908                         return ret;
8909                 }
8910                 if (trans->msg_type == NFT_MSG_NEWRULE ||
8911                     trans->msg_type == NFT_MSG_DELRULE) {
8912                         chain = trans->ctx.chain;
8913
8914                         ret = nf_tables_commit_chain_prepare(net, chain);
8915                         if (ret < 0) {
8916                                 nf_tables_commit_chain_prepare_cancel(net);
8917                                 nf_tables_commit_audit_free(&adl);
8918                                 return ret;
8919                         }
8920                 }
8921         }
8922
8923         /* step 2.  Make rules_gen_X visible to packet path */
8924         list_for_each_entry(table, &nft_net->tables, list) {
8925                 list_for_each_entry(chain, &table->chains, list)
8926                         nf_tables_commit_chain(net, chain);
8927         }
8928
8929         /*
8930          * Bump generation counter, invalidate any dump in progress.
8931          * Cannot fail after this point.
8932          */
8933         base_seq = READ_ONCE(nft_net->base_seq);
8934         while (++base_seq == 0)
8935                 ;
8936
8937         WRITE_ONCE(nft_net->base_seq, base_seq);
8938
8939         /* step 3. Start new generation, rules_gen_X now in use. */
8940         net->nft.gencursor = nft_gencursor_next(net);
8941
8942         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
8943                 nf_tables_commit_audit_collect(&adl, trans->ctx.table,
8944                                                trans->msg_type);
8945                 switch (trans->msg_type) {
8946                 case NFT_MSG_NEWTABLE:
8947                         if (nft_trans_table_update(trans)) {
8948                                 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
8949                                         nft_trans_destroy(trans);
8950                                         break;
8951                                 }
8952                                 if (trans->ctx.table->flags & NFT_TABLE_F_DORMANT)
8953                                         nf_tables_table_disable(net, trans->ctx.table);
8954
8955                                 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
8956                         } else {
8957                                 nft_clear(net, trans->ctx.table);
8958                         }
8959                         nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
8960                         nft_trans_destroy(trans);
8961                         break;
8962                 case NFT_MSG_DELTABLE:
8963                         list_del_rcu(&trans->ctx.table->list);
8964                         nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
8965                         break;
8966                 case NFT_MSG_NEWCHAIN:
8967                         if (nft_trans_chain_update(trans)) {
8968                                 nft_chain_commit_update(trans);
8969                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
8970                                 /* trans destroyed after rcu grace period */
8971                         } else {
8972                                 nft_chain_commit_drop_policy(trans);
8973                                 nft_clear(net, trans->ctx.chain);
8974                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
8975                                 nft_trans_destroy(trans);
8976                         }
8977                         break;
8978                 case NFT_MSG_DELCHAIN:
8979                         nft_chain_del(trans->ctx.chain);
8980                         nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
8981                         nf_tables_unregister_hook(trans->ctx.net,
8982                                                   trans->ctx.table,
8983                                                   trans->ctx.chain);
8984                         break;
8985                 case NFT_MSG_NEWRULE:
8986                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
8987                         nf_tables_rule_notify(&trans->ctx,
8988                                               nft_trans_rule(trans),
8989                                               NFT_MSG_NEWRULE);
8990                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
8991                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
8992
8993                         nft_trans_destroy(trans);
8994                         break;
8995                 case NFT_MSG_DELRULE:
8996                         list_del_rcu(&nft_trans_rule(trans)->list);
8997                         nf_tables_rule_notify(&trans->ctx,
8998                                               nft_trans_rule(trans),
8999                                               NFT_MSG_DELRULE);
9000                         nft_rule_expr_deactivate(&trans->ctx,
9001                                                  nft_trans_rule(trans),
9002                                                  NFT_TRANS_COMMIT);
9003
9004                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9005                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9006                         break;
9007                 case NFT_MSG_NEWSET:
9008                         nft_clear(net, nft_trans_set(trans));
9009                         /* This avoids hitting -EBUSY when deleting the table
9010                          * from the transaction.
9011                          */
9012                         if (nft_set_is_anonymous(nft_trans_set(trans)) &&
9013                             !list_empty(&nft_trans_set(trans)->bindings))
9014                                 trans->ctx.table->use--;
9015
9016                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
9017                                              NFT_MSG_NEWSET, GFP_KERNEL);
9018                         nft_trans_destroy(trans);
9019                         break;
9020                 case NFT_MSG_DELSET:
9021                         list_del_rcu(&nft_trans_set(trans)->list);
9022                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
9023                                              NFT_MSG_DELSET, GFP_KERNEL);
9024                         break;
9025                 case NFT_MSG_NEWSETELEM:
9026                         te = (struct nft_trans_elem *)trans->data;
9027
9028                         nft_setelem_activate(net, te->set, &te->elem);
9029                         nf_tables_setelem_notify(&trans->ctx, te->set,
9030                                                  &te->elem,
9031                                                  NFT_MSG_NEWSETELEM);
9032                         nft_trans_destroy(trans);
9033                         break;
9034                 case NFT_MSG_DELSETELEM:
9035                         te = (struct nft_trans_elem *)trans->data;
9036
9037                         nf_tables_setelem_notify(&trans->ctx, te->set,
9038                                                  &te->elem,
9039                                                  NFT_MSG_DELSETELEM);
9040                         nft_setelem_remove(net, te->set, &te->elem);
9041                         if (!nft_setelem_is_catchall(te->set, &te->elem)) {
9042                                 atomic_dec(&te->set->nelems);
9043                                 te->set->ndeact--;
9044                         }
9045                         break;
9046                 case NFT_MSG_NEWOBJ:
9047                         if (nft_trans_obj_update(trans)) {
9048                                 nft_obj_commit_update(trans);
9049                                 nf_tables_obj_notify(&trans->ctx,
9050                                                      nft_trans_obj(trans),
9051                                                      NFT_MSG_NEWOBJ);
9052                         } else {
9053                                 nft_clear(net, nft_trans_obj(trans));
9054                                 nf_tables_obj_notify(&trans->ctx,
9055                                                      nft_trans_obj(trans),
9056                                                      NFT_MSG_NEWOBJ);
9057                                 nft_trans_destroy(trans);
9058                         }
9059                         break;
9060                 case NFT_MSG_DELOBJ:
9061                         nft_obj_del(nft_trans_obj(trans));
9062                         nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
9063                                              NFT_MSG_DELOBJ);
9064                         break;
9065                 case NFT_MSG_NEWFLOWTABLE:
9066                         if (nft_trans_flowtable_update(trans)) {
9067                                 nft_trans_flowtable(trans)->data.flags =
9068                                         nft_trans_flowtable_flags(trans);
9069                                 nf_tables_flowtable_notify(&trans->ctx,
9070                                                            nft_trans_flowtable(trans),
9071                                                            &nft_trans_flowtable_hooks(trans),
9072                                                            NFT_MSG_NEWFLOWTABLE);
9073                                 list_splice(&nft_trans_flowtable_hooks(trans),
9074                                             &nft_trans_flowtable(trans)->hook_list);
9075                         } else {
9076                                 nft_clear(net, nft_trans_flowtable(trans));
9077                                 nf_tables_flowtable_notify(&trans->ctx,
9078                                                            nft_trans_flowtable(trans),
9079                                                            &nft_trans_flowtable(trans)->hook_list,
9080                                                            NFT_MSG_NEWFLOWTABLE);
9081                         }
9082                         nft_trans_destroy(trans);
9083                         break;
9084                 case NFT_MSG_DELFLOWTABLE:
9085                         if (nft_trans_flowtable_update(trans)) {
9086                                 nf_tables_flowtable_notify(&trans->ctx,
9087                                                            nft_trans_flowtable(trans),
9088                                                            &nft_trans_flowtable_hooks(trans),
9089                                                            NFT_MSG_DELFLOWTABLE);
9090                                 nft_unregister_flowtable_net_hooks(net,
9091                                                                    &nft_trans_flowtable_hooks(trans));
9092                         } else {
9093                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
9094                                 nf_tables_flowtable_notify(&trans->ctx,
9095                                                            nft_trans_flowtable(trans),
9096                                                            &nft_trans_flowtable(trans)->hook_list,
9097                                                            NFT_MSG_DELFLOWTABLE);
9098                                 nft_unregister_flowtable_net_hooks(net,
9099                                                 &nft_trans_flowtable(trans)->hook_list);
9100                         }
9101                         break;
9102                 }
9103         }
9104
9105         nft_commit_notify(net, NETLINK_CB(skb).portid);
9106         nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
9107         nf_tables_commit_audit_log(&adl, nft_net->base_seq);
9108         nf_tables_commit_release(net);
9109
9110         return 0;
9111 }
9112
9113 static void nf_tables_module_autoload(struct net *net)
9114 {
9115         struct nftables_pernet *nft_net = nft_pernet(net);
9116         struct nft_module_request *req, *next;
9117         LIST_HEAD(module_list);
9118
9119         list_splice_init(&nft_net->module_list, &module_list);
9120         mutex_unlock(&nft_net->commit_mutex);
9121         list_for_each_entry_safe(req, next, &module_list, list) {
9122                 request_module("%s", req->module);
9123                 req->done = true;
9124         }
9125         mutex_lock(&nft_net->commit_mutex);
9126         list_splice(&module_list, &nft_net->module_list);
9127 }
9128
9129 static void nf_tables_abort_release(struct nft_trans *trans)
9130 {
9131         switch (trans->msg_type) {
9132         case NFT_MSG_NEWTABLE:
9133                 nf_tables_table_destroy(&trans->ctx);
9134                 break;
9135         case NFT_MSG_NEWCHAIN:
9136                 nf_tables_chain_destroy(&trans->ctx);
9137                 break;
9138         case NFT_MSG_NEWRULE:
9139                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
9140                 break;
9141         case NFT_MSG_NEWSET:
9142                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
9143                 break;
9144         case NFT_MSG_NEWSETELEM:
9145                 nft_set_elem_destroy(nft_trans_elem_set(trans),
9146                                      nft_trans_elem(trans).priv, true);
9147                 break;
9148         case NFT_MSG_NEWOBJ:
9149                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
9150                 break;
9151         case NFT_MSG_NEWFLOWTABLE:
9152                 if (nft_trans_flowtable_update(trans))
9153                         nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
9154                 else
9155                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
9156                 break;
9157         }
9158         kfree(trans);
9159 }
9160
9161 static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
9162 {
9163         struct nftables_pernet *nft_net = nft_pernet(net);
9164         struct nft_trans *trans, *next;
9165         struct nft_trans_elem *te;
9166
9167         if (action == NFNL_ABORT_VALIDATE &&
9168             nf_tables_validate(net) < 0)
9169                 return -EAGAIN;
9170
9171         list_for_each_entry_safe_reverse(trans, next, &nft_net->commit_list,
9172                                          list) {
9173                 switch (trans->msg_type) {
9174                 case NFT_MSG_NEWTABLE:
9175                         if (nft_trans_table_update(trans)) {
9176                                 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
9177                                         nft_trans_destroy(trans);
9178                                         break;
9179                                 }
9180                                 if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_DORMANT) {
9181                                         nf_tables_table_disable(net, trans->ctx.table);
9182                                         trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
9183                                 } else if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_AWAKEN) {
9184                                         trans->ctx.table->flags &= ~NFT_TABLE_F_DORMANT;
9185                                 }
9186                                 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
9187                                 nft_trans_destroy(trans);
9188                         } else {
9189                                 list_del_rcu(&trans->ctx.table->list);
9190                         }
9191                         break;
9192                 case NFT_MSG_DELTABLE:
9193                         nft_clear(trans->ctx.net, trans->ctx.table);
9194                         nft_trans_destroy(trans);
9195                         break;
9196                 case NFT_MSG_NEWCHAIN:
9197                         if (nft_trans_chain_update(trans)) {
9198                                 free_percpu(nft_trans_chain_stats(trans));
9199                                 kfree(nft_trans_chain_name(trans));
9200                                 nft_trans_destroy(trans);
9201                         } else {
9202                                 if (nft_chain_is_bound(trans->ctx.chain)) {
9203                                         nft_trans_destroy(trans);
9204                                         break;
9205                                 }
9206                                 trans->ctx.table->use--;
9207                                 nft_chain_del(trans->ctx.chain);
9208                                 nf_tables_unregister_hook(trans->ctx.net,
9209                                                           trans->ctx.table,
9210                                                           trans->ctx.chain);
9211                         }
9212                         break;
9213                 case NFT_MSG_DELCHAIN:
9214                         trans->ctx.table->use++;
9215                         nft_clear(trans->ctx.net, trans->ctx.chain);
9216                         nft_trans_destroy(trans);
9217                         break;
9218                 case NFT_MSG_NEWRULE:
9219                         trans->ctx.chain->use--;
9220                         list_del_rcu(&nft_trans_rule(trans)->list);
9221                         nft_rule_expr_deactivate(&trans->ctx,
9222                                                  nft_trans_rule(trans),
9223                                                  NFT_TRANS_ABORT);
9224                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9225                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9226                         break;
9227                 case NFT_MSG_DELRULE:
9228                         trans->ctx.chain->use++;
9229                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
9230                         nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
9231                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9232                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9233
9234                         nft_trans_destroy(trans);
9235                         break;
9236                 case NFT_MSG_NEWSET:
9237                         trans->ctx.table->use--;
9238                         if (nft_trans_set_bound(trans)) {
9239                                 nft_trans_destroy(trans);
9240                                 break;
9241                         }
9242                         list_del_rcu(&nft_trans_set(trans)->list);
9243                         break;
9244                 case NFT_MSG_DELSET:
9245                         trans->ctx.table->use++;
9246                         nft_clear(trans->ctx.net, nft_trans_set(trans));
9247                         nft_trans_destroy(trans);
9248                         break;
9249                 case NFT_MSG_NEWSETELEM:
9250                         if (nft_trans_elem_set_bound(trans)) {
9251                                 nft_trans_destroy(trans);
9252                                 break;
9253                         }
9254                         te = (struct nft_trans_elem *)trans->data;
9255                         nft_setelem_remove(net, te->set, &te->elem);
9256                         if (!nft_setelem_is_catchall(te->set, &te->elem))
9257                                 atomic_dec(&te->set->nelems);
9258                         break;
9259                 case NFT_MSG_DELSETELEM:
9260                         te = (struct nft_trans_elem *)trans->data;
9261
9262                         nft_setelem_data_activate(net, te->set, &te->elem);
9263                         nft_setelem_activate(net, te->set, &te->elem);
9264                         if (!nft_setelem_is_catchall(te->set, &te->elem))
9265                                 te->set->ndeact--;
9266
9267                         nft_trans_destroy(trans);
9268                         break;
9269                 case NFT_MSG_NEWOBJ:
9270                         if (nft_trans_obj_update(trans)) {
9271                                 nft_obj_destroy(&trans->ctx, nft_trans_obj_newobj(trans));
9272                                 nft_trans_destroy(trans);
9273                         } else {
9274                                 trans->ctx.table->use--;
9275                                 nft_obj_del(nft_trans_obj(trans));
9276                         }
9277                         break;
9278                 case NFT_MSG_DELOBJ:
9279                         trans->ctx.table->use++;
9280                         nft_clear(trans->ctx.net, nft_trans_obj(trans));
9281                         nft_trans_destroy(trans);
9282                         break;
9283                 case NFT_MSG_NEWFLOWTABLE:
9284                         if (nft_trans_flowtable_update(trans)) {
9285                                 nft_unregister_flowtable_net_hooks(net,
9286                                                 &nft_trans_flowtable_hooks(trans));
9287                         } else {
9288                                 trans->ctx.table->use--;
9289                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
9290                                 nft_unregister_flowtable_net_hooks(net,
9291                                                 &nft_trans_flowtable(trans)->hook_list);
9292                         }
9293                         break;
9294                 case NFT_MSG_DELFLOWTABLE:
9295                         if (nft_trans_flowtable_update(trans)) {
9296                                 list_splice(&nft_trans_flowtable_hooks(trans),
9297                                             &nft_trans_flowtable(trans)->hook_list);
9298                         } else {
9299                                 trans->ctx.table->use++;
9300                                 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
9301                         }
9302                         nft_trans_destroy(trans);
9303                         break;
9304                 }
9305         }
9306
9307         synchronize_rcu();
9308
9309         list_for_each_entry_safe_reverse(trans, next,
9310                                          &nft_net->commit_list, list) {
9311                 list_del(&trans->list);
9312                 nf_tables_abort_release(trans);
9313         }
9314
9315         if (action == NFNL_ABORT_AUTOLOAD)
9316                 nf_tables_module_autoload(net);
9317         else
9318                 nf_tables_module_autoload_cleanup(net);
9319
9320         return 0;
9321 }
9322
9323 static void nf_tables_cleanup(struct net *net)
9324 {
9325         nft_validate_state_update(net, NFT_VALIDATE_SKIP);
9326 }
9327
9328 static int nf_tables_abort(struct net *net, struct sk_buff *skb,
9329                            enum nfnl_abort_action action)
9330 {
9331         struct nftables_pernet *nft_net = nft_pernet(net);
9332         int ret = __nf_tables_abort(net, action);
9333
9334         mutex_unlock(&nft_net->commit_mutex);
9335
9336         return ret;
9337 }
9338
9339 static bool nf_tables_valid_genid(struct net *net, u32 genid)
9340 {
9341         struct nftables_pernet *nft_net = nft_pernet(net);
9342         bool genid_ok;
9343
9344         mutex_lock(&nft_net->commit_mutex);
9345
9346         genid_ok = genid == 0 || nft_net->base_seq == genid;
9347         if (!genid_ok)
9348                 mutex_unlock(&nft_net->commit_mutex);
9349
9350         /* else, commit mutex has to be released by commit or abort function */
9351         return genid_ok;
9352 }
9353
9354 static const struct nfnetlink_subsystem nf_tables_subsys = {
9355         .name           = "nf_tables",
9356         .subsys_id      = NFNL_SUBSYS_NFTABLES,
9357         .cb_count       = NFT_MSG_MAX,
9358         .cb             = nf_tables_cb,
9359         .commit         = nf_tables_commit,
9360         .abort          = nf_tables_abort,
9361         .cleanup        = nf_tables_cleanup,
9362         .valid_genid    = nf_tables_valid_genid,
9363         .owner          = THIS_MODULE,
9364 };
9365
9366 int nft_chain_validate_dependency(const struct nft_chain *chain,
9367                                   enum nft_chain_types type)
9368 {
9369         const struct nft_base_chain *basechain;
9370
9371         if (nft_is_base_chain(chain)) {
9372                 basechain = nft_base_chain(chain);
9373                 if (basechain->type->type != type)
9374                         return -EOPNOTSUPP;
9375         }
9376         return 0;
9377 }
9378 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
9379
9380 int nft_chain_validate_hooks(const struct nft_chain *chain,
9381                              unsigned int hook_flags)
9382 {
9383         struct nft_base_chain *basechain;
9384
9385         if (nft_is_base_chain(chain)) {
9386                 basechain = nft_base_chain(chain);
9387
9388                 if ((1 << basechain->ops.hooknum) & hook_flags)
9389                         return 0;
9390
9391                 return -EOPNOTSUPP;
9392         }
9393
9394         return 0;
9395 }
9396 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
9397
9398 /*
9399  * Loop detection - walk through the ruleset beginning at the destination chain
9400  * of a new jump until either the source chain is reached (loop) or all
9401  * reachable chains have been traversed.
9402  *
9403  * The loop check is performed whenever a new jump verdict is added to an
9404  * expression or verdict map or a verdict map is bound to a new chain.
9405  */
9406
9407 static int nf_tables_check_loops(const struct nft_ctx *ctx,
9408                                  const struct nft_chain *chain);
9409
9410 static int nft_check_loops(const struct nft_ctx *ctx,
9411                            const struct nft_set_ext *ext)
9412 {
9413         const struct nft_data *data;
9414         int ret;
9415
9416         data = nft_set_ext_data(ext);
9417         switch (data->verdict.code) {
9418         case NFT_JUMP:
9419         case NFT_GOTO:
9420                 ret = nf_tables_check_loops(ctx, data->verdict.chain);
9421                 break;
9422         default:
9423                 ret = 0;
9424                 break;
9425         }
9426
9427         return ret;
9428 }
9429
9430 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
9431                                         struct nft_set *set,
9432                                         const struct nft_set_iter *iter,
9433                                         struct nft_set_elem *elem)
9434 {
9435         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
9436
9437         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
9438             *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
9439                 return 0;
9440
9441         return nft_check_loops(ctx, ext);
9442 }
9443
9444 static int nft_set_catchall_loops(const struct nft_ctx *ctx,
9445                                   struct nft_set *set)
9446 {
9447         u8 genmask = nft_genmask_next(ctx->net);
9448         struct nft_set_elem_catchall *catchall;
9449         struct nft_set_ext *ext;
9450         int ret = 0;
9451
9452         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
9453                 ext = nft_set_elem_ext(set, catchall->elem);
9454                 if (!nft_set_elem_active(ext, genmask))
9455                         continue;
9456
9457                 ret = nft_check_loops(ctx, ext);
9458                 if (ret < 0)
9459                         return ret;
9460         }
9461
9462         return ret;
9463 }
9464
9465 static int nf_tables_check_loops(const struct nft_ctx *ctx,
9466                                  const struct nft_chain *chain)
9467 {
9468         const struct nft_rule *rule;
9469         const struct nft_expr *expr, *last;
9470         struct nft_set *set;
9471         struct nft_set_binding *binding;
9472         struct nft_set_iter iter;
9473
9474         if (ctx->chain == chain)
9475                 return -ELOOP;
9476
9477         list_for_each_entry(rule, &chain->rules, list) {
9478                 nft_rule_for_each_expr(expr, last, rule) {
9479                         struct nft_immediate_expr *priv;
9480                         const struct nft_data *data;
9481                         int err;
9482
9483                         if (strcmp(expr->ops->type->name, "immediate"))
9484                                 continue;
9485
9486                         priv = nft_expr_priv(expr);
9487                         if (priv->dreg != NFT_REG_VERDICT)
9488                                 continue;
9489
9490                         data = &priv->data;
9491                         switch (data->verdict.code) {
9492                         case NFT_JUMP:
9493                         case NFT_GOTO:
9494                                 err = nf_tables_check_loops(ctx,
9495                                                         data->verdict.chain);
9496                                 if (err < 0)
9497                                         return err;
9498                                 break;
9499                         default:
9500                                 break;
9501                         }
9502                 }
9503         }
9504
9505         list_for_each_entry(set, &ctx->table->sets, list) {
9506                 if (!nft_is_active_next(ctx->net, set))
9507                         continue;
9508                 if (!(set->flags & NFT_SET_MAP) ||
9509                     set->dtype != NFT_DATA_VERDICT)
9510                         continue;
9511
9512                 list_for_each_entry(binding, &set->bindings, list) {
9513                         if (!(binding->flags & NFT_SET_MAP) ||
9514                             binding->chain != chain)
9515                                 continue;
9516
9517                         iter.genmask    = nft_genmask_next(ctx->net);
9518                         iter.skip       = 0;
9519                         iter.count      = 0;
9520                         iter.err        = 0;
9521                         iter.fn         = nf_tables_loop_check_setelem;
9522
9523                         set->ops->walk(ctx, set, &iter);
9524                         if (!iter.err)
9525                                 iter.err = nft_set_catchall_loops(ctx, set);
9526
9527                         if (iter.err < 0)
9528                                 return iter.err;
9529                 }
9530         }
9531
9532         return 0;
9533 }
9534
9535 /**
9536  *      nft_parse_u32_check - fetch u32 attribute and check for maximum value
9537  *
9538  *      @attr: netlink attribute to fetch value from
9539  *      @max: maximum value to be stored in dest
9540  *      @dest: pointer to the variable
9541  *
9542  *      Parse, check and store a given u32 netlink attribute into variable.
9543  *      This function returns -ERANGE if the value goes over maximum value.
9544  *      Otherwise a 0 is returned and the attribute value is stored in the
9545  *      destination variable.
9546  */
9547 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
9548 {
9549         u32 val;
9550
9551         val = ntohl(nla_get_be32(attr));
9552         if (val > max)
9553                 return -ERANGE;
9554
9555         *dest = val;
9556         return 0;
9557 }
9558 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
9559
9560 static int nft_parse_register(const struct nlattr *attr, u32 *preg)
9561 {
9562         unsigned int reg;
9563
9564         reg = ntohl(nla_get_be32(attr));
9565         switch (reg) {
9566         case NFT_REG_VERDICT...NFT_REG_4:
9567                 *preg = reg * NFT_REG_SIZE / NFT_REG32_SIZE;
9568                 break;
9569         case NFT_REG32_00...NFT_REG32_15:
9570                 *preg = reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
9571                 break;
9572         default:
9573                 return -ERANGE;
9574         }
9575
9576         return 0;
9577 }
9578
9579 /**
9580  *      nft_dump_register - dump a register value to a netlink attribute
9581  *
9582  *      @skb: socket buffer
9583  *      @attr: attribute number
9584  *      @reg: register number
9585  *
9586  *      Construct a netlink attribute containing the register number. For
9587  *      compatibility reasons, register numbers being a multiple of 4 are
9588  *      translated to the corresponding 128 bit register numbers.
9589  */
9590 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
9591 {
9592         if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
9593                 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
9594         else
9595                 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
9596
9597         return nla_put_be32(skb, attr, htonl(reg));
9598 }
9599 EXPORT_SYMBOL_GPL(nft_dump_register);
9600
9601 static int nft_validate_register_load(enum nft_registers reg, unsigned int len)
9602 {
9603         if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
9604                 return -EINVAL;
9605         if (len == 0)
9606                 return -EINVAL;
9607         if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
9608                 return -ERANGE;
9609
9610         return 0;
9611 }
9612
9613 int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len)
9614 {
9615         u32 reg;
9616         int err;
9617
9618         err = nft_parse_register(attr, &reg);
9619         if (err < 0)
9620                 return err;
9621
9622         err = nft_validate_register_load(reg, len);
9623         if (err < 0)
9624                 return err;
9625
9626         *sreg = reg;
9627         return 0;
9628 }
9629 EXPORT_SYMBOL_GPL(nft_parse_register_load);
9630
9631 static int nft_validate_register_store(const struct nft_ctx *ctx,
9632                                        enum nft_registers reg,
9633                                        const struct nft_data *data,
9634                                        enum nft_data_types type,
9635                                        unsigned int len)
9636 {
9637         int err;
9638
9639         switch (reg) {
9640         case NFT_REG_VERDICT:
9641                 if (type != NFT_DATA_VERDICT)
9642                         return -EINVAL;
9643
9644                 if (data != NULL &&
9645                     (data->verdict.code == NFT_GOTO ||
9646                      data->verdict.code == NFT_JUMP)) {
9647                         err = nf_tables_check_loops(ctx, data->verdict.chain);
9648                         if (err < 0)
9649                                 return err;
9650                 }
9651
9652                 return 0;
9653         default:
9654                 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
9655                         return -EINVAL;
9656                 if (len == 0)
9657                         return -EINVAL;
9658                 if (reg * NFT_REG32_SIZE + len >
9659                     sizeof_field(struct nft_regs, data))
9660                         return -ERANGE;
9661
9662                 if (data != NULL && type != NFT_DATA_VALUE)
9663                         return -EINVAL;
9664                 return 0;
9665         }
9666 }
9667
9668 int nft_parse_register_store(const struct nft_ctx *ctx,
9669                              const struct nlattr *attr, u8 *dreg,
9670                              const struct nft_data *data,
9671                              enum nft_data_types type, unsigned int len)
9672 {
9673         int err;
9674         u32 reg;
9675
9676         err = nft_parse_register(attr, &reg);
9677         if (err < 0)
9678                 return err;
9679
9680         err = nft_validate_register_store(ctx, reg, data, type, len);
9681         if (err < 0)
9682                 return err;
9683
9684         *dreg = reg;
9685         return 0;
9686 }
9687 EXPORT_SYMBOL_GPL(nft_parse_register_store);
9688
9689 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
9690         [NFTA_VERDICT_CODE]     = { .type = NLA_U32 },
9691         [NFTA_VERDICT_CHAIN]    = { .type = NLA_STRING,
9692                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
9693         [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 },
9694 };
9695
9696 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
9697                             struct nft_data_desc *desc, const struct nlattr *nla)
9698 {
9699         u8 genmask = nft_genmask_next(ctx->net);
9700         struct nlattr *tb[NFTA_VERDICT_MAX + 1];
9701         struct nft_chain *chain;
9702         int err;
9703
9704         err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
9705                                           nft_verdict_policy, NULL);
9706         if (err < 0)
9707                 return err;
9708
9709         if (!tb[NFTA_VERDICT_CODE])
9710                 return -EINVAL;
9711         data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
9712
9713         switch (data->verdict.code) {
9714         default:
9715                 switch (data->verdict.code & NF_VERDICT_MASK) {
9716                 case NF_ACCEPT:
9717                 case NF_DROP:
9718                 case NF_QUEUE:
9719                         break;
9720                 default:
9721                         return -EINVAL;
9722                 }
9723                 fallthrough;
9724         case NFT_CONTINUE:
9725         case NFT_BREAK:
9726         case NFT_RETURN:
9727                 break;
9728         case NFT_JUMP:
9729         case NFT_GOTO:
9730                 if (tb[NFTA_VERDICT_CHAIN]) {
9731                         chain = nft_chain_lookup(ctx->net, ctx->table,
9732                                                  tb[NFTA_VERDICT_CHAIN],
9733                                                  genmask);
9734                 } else if (tb[NFTA_VERDICT_CHAIN_ID]) {
9735                         chain = nft_chain_lookup_byid(ctx->net, ctx->table,
9736                                                       tb[NFTA_VERDICT_CHAIN_ID]);
9737                         if (IS_ERR(chain))
9738                                 return PTR_ERR(chain);
9739                 } else {
9740                         return -EINVAL;
9741                 }
9742
9743                 if (IS_ERR(chain))
9744                         return PTR_ERR(chain);
9745                 if (nft_is_base_chain(chain))
9746                         return -EOPNOTSUPP;
9747                 if (nft_chain_is_bound(chain))
9748                         return -EINVAL;
9749                 if (desc->flags & NFT_DATA_DESC_SETELEM &&
9750                     chain->flags & NFT_CHAIN_BINDING)
9751                         return -EINVAL;
9752
9753                 chain->use++;
9754                 data->verdict.chain = chain;
9755                 break;
9756         }
9757
9758         desc->len = sizeof(data->verdict);
9759
9760         return 0;
9761 }
9762
9763 static void nft_verdict_uninit(const struct nft_data *data)
9764 {
9765         struct nft_chain *chain;
9766         struct nft_rule *rule;
9767
9768         switch (data->verdict.code) {
9769         case NFT_JUMP:
9770         case NFT_GOTO:
9771                 chain = data->verdict.chain;
9772                 chain->use--;
9773
9774                 if (!nft_chain_is_bound(chain))
9775                         break;
9776
9777                 chain->table->use--;
9778                 list_for_each_entry(rule, &chain->rules, list)
9779                         chain->use--;
9780
9781                 nft_chain_del(chain);
9782                 break;
9783         }
9784 }
9785
9786 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
9787 {
9788         struct nlattr *nest;
9789
9790         nest = nla_nest_start_noflag(skb, type);
9791         if (!nest)
9792                 goto nla_put_failure;
9793
9794         if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
9795                 goto nla_put_failure;
9796
9797         switch (v->code) {
9798         case NFT_JUMP:
9799         case NFT_GOTO:
9800                 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
9801                                    v->chain->name))
9802                         goto nla_put_failure;
9803         }
9804         nla_nest_end(skb, nest);
9805         return 0;
9806
9807 nla_put_failure:
9808         return -1;
9809 }
9810
9811 static int nft_value_init(const struct nft_ctx *ctx,
9812                           struct nft_data *data, struct nft_data_desc *desc,
9813                           const struct nlattr *nla)
9814 {
9815         unsigned int len;
9816
9817         len = nla_len(nla);
9818         if (len == 0)
9819                 return -EINVAL;
9820         if (len > desc->size)
9821                 return -EOVERFLOW;
9822         if (desc->len) {
9823                 if (len != desc->len)
9824                         return -EINVAL;
9825         } else {
9826                 desc->len = len;
9827         }
9828
9829         nla_memcpy(data->data, nla, len);
9830
9831         return 0;
9832 }
9833
9834 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
9835                           unsigned int len)
9836 {
9837         return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
9838 }
9839
9840 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
9841         [NFTA_DATA_VALUE]       = { .type = NLA_BINARY },
9842         [NFTA_DATA_VERDICT]     = { .type = NLA_NESTED },
9843 };
9844
9845 /**
9846  *      nft_data_init - parse nf_tables data netlink attributes
9847  *
9848  *      @ctx: context of the expression using the data
9849  *      @data: destination struct nft_data
9850  *      @desc: data description
9851  *      @nla: netlink attribute containing data
9852  *
9853  *      Parse the netlink data attributes and initialize a struct nft_data.
9854  *      The type and length of data are returned in the data description.
9855  *
9856  *      The caller can indicate that it only wants to accept data of type
9857  *      NFT_DATA_VALUE by passing NULL for the ctx argument.
9858  */
9859 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
9860                   struct nft_data_desc *desc, const struct nlattr *nla)
9861 {
9862         struct nlattr *tb[NFTA_DATA_MAX + 1];
9863         int err;
9864
9865         if (WARN_ON_ONCE(!desc->size))
9866                 return -EINVAL;
9867
9868         err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
9869                                           nft_data_policy, NULL);
9870         if (err < 0)
9871                 return err;
9872
9873         if (tb[NFTA_DATA_VALUE]) {
9874                 if (desc->type != NFT_DATA_VALUE)
9875                         return -EINVAL;
9876
9877                 err = nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]);
9878         } else if (tb[NFTA_DATA_VERDICT] && ctx != NULL) {
9879                 if (desc->type != NFT_DATA_VERDICT)
9880                         return -EINVAL;
9881
9882                 err = nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
9883         } else {
9884                 err = -EINVAL;
9885         }
9886
9887         return err;
9888 }
9889 EXPORT_SYMBOL_GPL(nft_data_init);
9890
9891 /**
9892  *      nft_data_release - release a nft_data item
9893  *
9894  *      @data: struct nft_data to release
9895  *      @type: type of data
9896  *
9897  *      Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
9898  *      all others need to be released by calling this function.
9899  */
9900 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
9901 {
9902         if (type < NFT_DATA_VERDICT)
9903                 return;
9904         switch (type) {
9905         case NFT_DATA_VERDICT:
9906                 return nft_verdict_uninit(data);
9907         default:
9908                 WARN_ON(1);
9909         }
9910 }
9911 EXPORT_SYMBOL_GPL(nft_data_release);
9912
9913 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
9914                   enum nft_data_types type, unsigned int len)
9915 {
9916         struct nlattr *nest;
9917         int err;
9918
9919         nest = nla_nest_start_noflag(skb, attr);
9920         if (nest == NULL)
9921                 return -1;
9922
9923         switch (type) {
9924         case NFT_DATA_VALUE:
9925                 err = nft_value_dump(skb, data, len);
9926                 break;
9927         case NFT_DATA_VERDICT:
9928                 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
9929                 break;
9930         default:
9931                 err = -EINVAL;
9932                 WARN_ON(1);
9933         }
9934
9935         nla_nest_end(skb, nest);
9936         return err;
9937 }
9938 EXPORT_SYMBOL_GPL(nft_data_dump);
9939
9940 int __nft_release_basechain(struct nft_ctx *ctx)
9941 {
9942         struct nft_rule *rule, *nr;
9943
9944         if (WARN_ON(!nft_is_base_chain(ctx->chain)))
9945                 return 0;
9946
9947         nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
9948         list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
9949                 list_del(&rule->list);
9950                 ctx->chain->use--;
9951                 nf_tables_rule_release(ctx, rule);
9952         }
9953         nft_chain_del(ctx->chain);
9954         ctx->table->use--;
9955         nf_tables_chain_destroy(ctx);
9956
9957         return 0;
9958 }
9959 EXPORT_SYMBOL_GPL(__nft_release_basechain);
9960
9961 static void __nft_release_hook(struct net *net, struct nft_table *table)
9962 {
9963         struct nft_flowtable *flowtable;
9964         struct nft_chain *chain;
9965
9966         list_for_each_entry(chain, &table->chains, list)
9967                 __nf_tables_unregister_hook(net, table, chain, true);
9968         list_for_each_entry(flowtable, &table->flowtables, list)
9969                 __nft_unregister_flowtable_net_hooks(net, &flowtable->hook_list,
9970                                                      true);
9971 }
9972
9973 static void __nft_release_hooks(struct net *net)
9974 {
9975         struct nftables_pernet *nft_net = nft_pernet(net);
9976         struct nft_table *table;
9977
9978         list_for_each_entry(table, &nft_net->tables, list) {
9979                 if (nft_table_has_owner(table))
9980                         continue;
9981
9982                 __nft_release_hook(net, table);
9983         }
9984 }
9985
9986 static void __nft_release_table(struct net *net, struct nft_table *table)
9987 {
9988         struct nft_flowtable *flowtable, *nf;
9989         struct nft_chain *chain, *nc;
9990         struct nft_object *obj, *ne;
9991         struct nft_rule *rule, *nr;
9992         struct nft_set *set, *ns;
9993         struct nft_ctx ctx = {
9994                 .net    = net,
9995                 .family = NFPROTO_NETDEV,
9996         };
9997
9998         ctx.family = table->family;
9999         ctx.table = table;
10000         list_for_each_entry(chain, &table->chains, list) {
10001                 ctx.chain = chain;
10002                 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
10003                         list_del(&rule->list);
10004                         chain->use--;
10005                         nf_tables_rule_release(&ctx, rule);
10006                 }
10007         }
10008         list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
10009                 list_del(&flowtable->list);
10010                 table->use--;
10011                 nf_tables_flowtable_destroy(flowtable);
10012         }
10013         list_for_each_entry_safe(set, ns, &table->sets, list) {
10014                 list_del(&set->list);
10015                 table->use--;
10016                 nft_set_destroy(&ctx, set);
10017         }
10018         list_for_each_entry_safe(obj, ne, &table->objects, list) {
10019                 nft_obj_del(obj);
10020                 table->use--;
10021                 nft_obj_destroy(&ctx, obj);
10022         }
10023         list_for_each_entry_safe(chain, nc, &table->chains, list) {
10024                 ctx.chain = chain;
10025                 nft_chain_del(chain);
10026                 table->use--;
10027                 nf_tables_chain_destroy(&ctx);
10028         }
10029         nf_tables_table_destroy(&ctx);
10030 }
10031
10032 static void __nft_release_tables(struct net *net)
10033 {
10034         struct nftables_pernet *nft_net = nft_pernet(net);
10035         struct nft_table *table, *nt;
10036
10037         list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
10038                 if (nft_table_has_owner(table))
10039                         continue;
10040
10041                 list_del(&table->list);
10042
10043                 __nft_release_table(net, table);
10044         }
10045 }
10046
10047 static int nft_rcv_nl_event(struct notifier_block *this, unsigned long event,
10048                             void *ptr)
10049 {
10050         struct nft_table *table, *to_delete[8];
10051         struct nftables_pernet *nft_net;
10052         struct netlink_notify *n = ptr;
10053         struct net *net = n->net;
10054         unsigned int deleted;
10055         bool restart = false;
10056
10057         if (event != NETLINK_URELEASE || n->protocol != NETLINK_NETFILTER)
10058                 return NOTIFY_DONE;
10059
10060         nft_net = nft_pernet(net);
10061         deleted = 0;
10062         mutex_lock(&nft_net->commit_mutex);
10063         if (!list_empty(&nf_tables_destroy_list))
10064                 rcu_barrier();
10065 again:
10066         list_for_each_entry(table, &nft_net->tables, list) {
10067                 if (nft_table_has_owner(table) &&
10068                     n->portid == table->nlpid) {
10069                         __nft_release_hook(net, table);
10070                         list_del_rcu(&table->list);
10071                         to_delete[deleted++] = table;
10072                         if (deleted >= ARRAY_SIZE(to_delete))
10073                                 break;
10074                 }
10075         }
10076         if (deleted) {
10077                 restart = deleted >= ARRAY_SIZE(to_delete);
10078                 synchronize_rcu();
10079                 while (deleted)
10080                         __nft_release_table(net, to_delete[--deleted]);
10081
10082                 if (restart)
10083                         goto again;
10084         }
10085         mutex_unlock(&nft_net->commit_mutex);
10086
10087         return NOTIFY_DONE;
10088 }
10089
10090 static struct notifier_block nft_nl_notifier = {
10091         .notifier_call  = nft_rcv_nl_event,
10092 };
10093
10094 static int __net_init nf_tables_init_net(struct net *net)
10095 {
10096         struct nftables_pernet *nft_net = nft_pernet(net);
10097
10098         INIT_LIST_HEAD(&nft_net->tables);
10099         INIT_LIST_HEAD(&nft_net->commit_list);
10100         INIT_LIST_HEAD(&nft_net->module_list);
10101         INIT_LIST_HEAD(&nft_net->notify_list);
10102         mutex_init(&nft_net->commit_mutex);
10103         nft_net->base_seq = 1;
10104         nft_net->validate_state = NFT_VALIDATE_SKIP;
10105
10106         return 0;
10107 }
10108
10109 static void __net_exit nf_tables_pre_exit_net(struct net *net)
10110 {
10111         struct nftables_pernet *nft_net = nft_pernet(net);
10112
10113         mutex_lock(&nft_net->commit_mutex);
10114         __nft_release_hooks(net);
10115         mutex_unlock(&nft_net->commit_mutex);
10116 }
10117
10118 static void __net_exit nf_tables_exit_net(struct net *net)
10119 {
10120         struct nftables_pernet *nft_net = nft_pernet(net);
10121
10122         mutex_lock(&nft_net->commit_mutex);
10123         if (!list_empty(&nft_net->commit_list) ||
10124             !list_empty(&nft_net->module_list))
10125                 __nf_tables_abort(net, NFNL_ABORT_NONE);
10126         __nft_release_tables(net);
10127         mutex_unlock(&nft_net->commit_mutex);
10128         WARN_ON_ONCE(!list_empty(&nft_net->tables));
10129         WARN_ON_ONCE(!list_empty(&nft_net->module_list));
10130         WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
10131 }
10132
10133 static struct pernet_operations nf_tables_net_ops = {
10134         .init           = nf_tables_init_net,
10135         .pre_exit       = nf_tables_pre_exit_net,
10136         .exit           = nf_tables_exit_net,
10137         .id             = &nf_tables_net_id,
10138         .size           = sizeof(struct nftables_pernet),
10139 };
10140
10141 static int __init nf_tables_module_init(void)
10142 {
10143         int err;
10144
10145         err = register_pernet_subsys(&nf_tables_net_ops);
10146         if (err < 0)
10147                 return err;
10148
10149         err = nft_chain_filter_init();
10150         if (err < 0)
10151                 goto err_chain_filter;
10152
10153         err = nf_tables_core_module_init();
10154         if (err < 0)
10155                 goto err_core_module;
10156
10157         err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
10158         if (err < 0)
10159                 goto err_netdev_notifier;
10160
10161         err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
10162         if (err < 0)
10163                 goto err_rht_objname;
10164
10165         err = nft_offload_init();
10166         if (err < 0)
10167                 goto err_offload;
10168
10169         err = netlink_register_notifier(&nft_nl_notifier);
10170         if (err < 0)
10171                 goto err_netlink_notifier;
10172
10173         /* must be last */
10174         err = nfnetlink_subsys_register(&nf_tables_subsys);
10175         if (err < 0)
10176                 goto err_nfnl_subsys;
10177
10178         nft_chain_route_init();
10179
10180         return err;
10181
10182 err_nfnl_subsys:
10183         netlink_unregister_notifier(&nft_nl_notifier);
10184 err_netlink_notifier:
10185         nft_offload_exit();
10186 err_offload:
10187         rhltable_destroy(&nft_objname_ht);
10188 err_rht_objname:
10189         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
10190 err_netdev_notifier:
10191         nf_tables_core_module_exit();
10192 err_core_module:
10193         nft_chain_filter_fini();
10194 err_chain_filter:
10195         unregister_pernet_subsys(&nf_tables_net_ops);
10196         return err;
10197 }
10198
10199 static void __exit nf_tables_module_exit(void)
10200 {
10201         nfnetlink_subsys_unregister(&nf_tables_subsys);
10202         netlink_unregister_notifier(&nft_nl_notifier);
10203         nft_offload_exit();
10204         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
10205         nft_chain_filter_fini();
10206         nft_chain_route_fini();
10207         unregister_pernet_subsys(&nf_tables_net_ops);
10208         cancel_work_sync(&trans_destroy_work);
10209         rcu_barrier();
10210         rhltable_destroy(&nft_objname_ht);
10211         nf_tables_core_module_exit();
10212 }
10213
10214 module_init(nf_tables_module_init);
10215 module_exit(nf_tables_module_exit);
10216
10217 MODULE_LICENSE("GPL");
10218 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
10219 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);